Commit Graph
12 Commits
Author SHA1 Message Date
Chris CoutinhoandClaude Opus 4.7 1fa4c82fd2 chore: address review-round-4 nits — stale delenv, upgrade hint, in-sync notes
Four small follow-ups from the reviewer's latest pass:

- tests/unit/test_stdio.py:18: the single_user_env fixture used
  monkeypatch.delenv("ENABLE_MULTI_USER_BASIC_AUTH", ...). That env var
  is no longer read after the ADR-022 follow-up; switched to delenv of
  MCP_DEPLOYMENT_MODE which is the canonical mode-selection input today.
  Comment updated to match.
- config_validators.py: when detect_auth_mode rejects an invalid
  MCP_DEPLOYMENT_MODE, surface a one-line ADR-022 migration hint if the
  rejected value is exactly "oauth_single_audience" (the most common
  upgrade pain — users carrying that value over from ADR-021 .env files).
  Other invalid values get the regular "Valid values: …" message
  unchanged.
- config.py + config_validators.py: added cross-reference comments on
  both mode-resolution sites (Settings.__post_init__ and
  detect_auth_mode) noting that they each compute the canonical mode
  independently and must be kept in sync when a new mode is added.
  Surfaces the parallel-duplication intentionally so the next maintainer
  doesn't have to discover it.
- docs/ADR-021-configuration-consolidation.md:92: appended a trailing
  comment to the historical "valid values" example, marking
  oauth_single_audience and oauth_token_exchange as removed in ADR-022.
  ADR-021 stays as the historical record; the trailer points future
  readers at the current state.

No functional changes; 1009 unit tests still pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-12 22:35:50 +02:00
Chris CoutinhoandClaude Opus 4.7 6e7c821761 fix(config): derive mode flags in Settings.__post_init__; address review round 2
The integration jobs for `mcp-multi-user-basic` and `mcp-login-flow`
were failing with HTTP 500s. Root cause: `get_settings()` builds a
fresh Settings on every call (not cached). Commits 3 and 4 set the
derived `enable_login_flow` / `enable_multi_user_basic_auth` flags as
a side effect of `detect_auth_mode`. detect_auth_mode runs once at
startup, against the Settings instance owned by `validate_configuration`.
Every per-request call site that does `settings = get_settings()` got
a fresh Settings with both flags at their default `False` (since the
env-var aliases were dropped), causing the multi-user dispatcher in
`context.py` to take the wrong branch and crash.

Fix: move the derivation into `Settings.__post_init__`. Every Settings
instance now carries correct flags from the moment it's constructed —
no caching needed, no mutation-after-construction race. detect_auth_mode
becomes a pure reader of the already-derived state.

The legacy env-var deprecation check moves with it. It also picks up
the reviewer's truthy-string fix: previously `os.getenv(legacy)` fired
for the literal string "false" (a non-empty Python string is truthy),
which would have errored on any user with a leftover
`ENABLE_LOGIN_FLOW=false` in their `.env`. The check now only fires
when the value lowercases to one of {"1", "true", "yes", "on"}.

- nextcloud_mcp_server/config.py: extend Settings.__post_init__ with
  the legacy-deprecation block and the derived-flag derivation
  (resolve mode from deployment_mode + username/password, set flags).
- nextcloud_mcp_server/config_validators.py: drop the
  `_sync_derived_flags` helper (superseded by __post_init__). Drop the
  legacy-env-var deprecation block (moved). `detect_auth_mode` is now
  pure — no mutation. Drop the now-unused `import os`.
- tests/unit/test_config_validators.py: legacy-env-var tests now
  expect `ValueError` at `Settings(...)` construction (via `get_settings()`),
  not at `detect_auth_mode` call. Added two new tests:
    * `test_legacy_env_var_check_ignores_falsy_strings` — pins the
      truthy-string fix (reviewer round 2 finding).
    * `test_derived_flags_stable_across_get_settings_calls` — regression
      test pinning the integration-test fix (two consecutive
      `get_settings()` calls return Settings instances with the same
      derived flags).
  Also reworked `test_login_flow_mode_auto_derives_enable_login_flow_flag`
  to assert at-construction derivation (not the old mutation pattern).
- docs/configuration-migration-v2.md: dropped the duplicate
  `MCP_DEPLOYMENT_MODE=multi_user_basic` line (review round 2 nit — a
  sed artifact from commit 4).
- docs/ADR-021-configuration-consolidation.md: sed-replaced the in-body
  `MCP_DEPLOYMENT_MODE=oauth_single_audience` examples with `login_flow`
  (review round 2 nit — only the status header was updated in commit 4).
- tests/conftest.py: docstring comment for the multi-user-basic fixture
  switched from `ENABLE_MULTI_USER_BASIC_AUTH=true` to
  `MCP_DEPLOYMENT_MODE=multi_user_basic` (review round 2 nit).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-12 20:44:17 +02:00
Chris CoutinhoandClaude Opus 4.7 282c245da1 refactor(config)!: drop ENABLE_MULTI_USER_BASIC_AUTH env var, fail loud on legacy aliases
Same pattern as the ENABLE_LOGIN_FLOW removal in the previous commit:
the deployment mode (MCP_DEPLOYMENT_MODE) is the single source of truth
for selecting an auth flow. The ENABLE_MULTI_USER_BASIC_AUTH env-var
alias is redundant with `MCP_DEPLOYMENT_MODE=multi_user_basic`.

Unlike the ENABLE_LOGIN_FLOW removal — where silent removal was safe
because Login Flow v2 is the auto-detection default — silent removal
here would be a surprise: a user with only ENABLE_MULTI_USER_BASIC_AUTH=true
in their .env would auto-detect into LOGIN_FLOW after upgrade (wrong
runtime mode). Mitigation: detect_auth_mode now reads os.environ
directly for both legacy aliases and raises ValueError with a one-line
migration message if either is set. Applied retroactively to
ENABLE_LOGIN_FLOW as well — loud is better than silent.

- nextcloud_mcp_server/config.py:
  - Drop the dynaconf env-var alias entry for ENABLE_MULTI_USER_BASIC_AUTH.
  - Update the `enable_multi_user_basic_auth` field docstring to mark it
    as derived / not user-settable.
  - `_is_multi_user_mode()` (early-config helper, runs before Settings
    is built) switched to checking MCP_DEPLOYMENT_MODE directly. Now
    consistent with the canonical detection in detect_auth_mode.
- nextcloud_mcp_server/config_validators.py:
  - Drop the auto-detection branch (`if settings.enable_multi_user_basic_auth`).
    Selection of MULTI_USER_BASIC is now exclusively via the explicit
    MCP_DEPLOYMENT_MODE branch.
  - Add `enable_multi_user_basic_auth` to `_sync_derived_flags` alongside
    `enable_login_flow` — both flags are now derived from the resolved mode.
  - Drop `enable_multi_user_basic_auth` from
    `MODE_REQUIREMENTS[MULTI_USER_BASIC].required` and from the
    `forbidden` lists of SINGLE_USER_BASIC and LOGIN_FLOW (no longer
    user input → no meaningful forbidden check).
  - Add loud-deprecation `ValueError` block at the top of detect_auth_mode
    that errors with a clear migration message when ENABLE_MULTI_USER_BASIC_AUTH
    or ENABLE_LOGIN_FLOW is found in os.environ.
- tests/unit/test_config_validators.py:
  - Switch ~10 fixtures from `enable_multi_user_basic_auth=True` to
    `deployment_mode="multi_user_basic"` (mirrors `enable_login_flow`
    treatment from the previous commit).
  - Switch two `patch.dict(os.environ, {"ENABLE_MULTI_USER_BASIC_AUTH": "true"})`
    blocks to use MCP_DEPLOYMENT_MODE.
  - Rename `test_forbidden_multi_user_basic_auth` to
    `test_forbidden_multi_user_basic_when_credentials_present` — the
    scenario is now an explicit-mode + credentials conflict, not an
    env-var-flag conflict.
  - Add `test_legacy_enable_multi_user_basic_auth_env_var_errors` and
    `test_legacy_enable_login_flow_env_var_errors` to exercise the new
    loud-deprecation ValueError path.
- docker-compose.yml: mcp-multi-user-basic profile switched to
  `MCP_DEPLOYMENT_MODE=multi_user_basic`.
- env.sample: replaced `#ENABLE_MULTI_USER_BASIC_AUTH=true` example with
  `#MCP_DEPLOYMENT_MODE=multi_user_basic`.
- docs/authentication.md, configuration.md, troubleshooting.md,
  auth-flows.md, webhook-management-guide.md,
  configuration-migration-v2.md, ADR-025: replaced env-var examples
  with the canonical MCP_DEPLOYMENT_MODE form.
- docs/ADR-020: marked partly superseded by ADR-022.
- CLAUDE.md: Multi-User BasicAuth section updated to set
  MCP_DEPLOYMENT_MODE.
- nextcloud_mcp_server/vector/oauth_sync.py: module docstring updated.

BREAKING CHANGE: ENABLE_MULTI_USER_BASIC_AUTH is no longer read from
the environment, and setting it now raises a startup ValueError with
a migration message. Replace `ENABLE_MULTI_USER_BASIC_AUTH=true` with
`MCP_DEPLOYMENT_MODE=multi_user_basic`. The same loud-deprecation
check is also applied to the recently-removed ENABLE_LOGIN_FLOW —
replace with `MCP_DEPLOYMENT_MODE=login_flow` (or drop both;
`login_flow` is the auto-detect default when no other auth env vars
are set).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-12 20:06:16 +02:00
Chris CoutinhoandClaude Opus 4.7 df4994e860 refactor(config)!: derive enable_login_flow from mode, remove ENABLE_LOGIN_FLOW env var
Once OAUTH_SINGLE_AUDIENCE was renamed to LOGIN_FLOW and the validation
gate ensured the only meaningful configuration was
`MCP_DEPLOYMENT_MODE=login_flow + ENABLE_LOGIN_FLOW=true`, the two
controls became redundant. Setting the mode is sufficient; the
ENABLE_LOGIN_FLOW env var doesn't add information.

This commit makes the deployment mode the single source of truth for
the Login Flow v2 toggle:

- `nextcloud_mcp_server/config.py`: drop the `ENABLE_LOGIN_FLOW`
  dynaconf env-var alias. The `enable_login_flow` field stays as an
  internal attribute so the 6 runtime call sites (app.py x4,
  context.py, auth/scope_authorization.py) keep working unchanged.
  Updated field docstring to flag it as derived.
- `nextcloud_mcp_server/config_validators.py`:
  - Drop `enable_login_flow` from `MODE_REQUIREMENTS[LOGIN_FLOW].required`.
  - Drop the validation gate that required ENABLE_LOGIN_FLOW=true for
    LOGIN_FLOW mode (no longer possible to misconfigure — the flag is
    derived, not user input).
  - Add `_sync_derived_flags()` helper called at every return path of
    `detect_auth_mode` to set `settings.enable_login_flow` from the
    resolved mode.
- `tests/unit/test_config_validators.py`: drop `enable_login_flow=True`
  from happy-path fixtures (no longer needed — detection sets it).
  Repurpose `test_login_flow_requires_enable_login_flow_flag` into
  `test_login_flow_mode_auto_derives_enable_login_flow_flag` which
  asserts the new auto-derivation behaviour for both LOGIN_FLOW and a
  non-LOGIN_FLOW mode.
- `docker-compose.yml`: remove `ENABLE_LOGIN_FLOW=true` from the
  `mcp-login-flow` and `mcp-keycloak` profiles.
- `env.sample`: remove the ENABLE_LOGIN_FLOW reference; the comment
  on `MCP_DEPLOYMENT_MODE` now notes the derived flag.
- `docs/configuration.md`, `docs/authentication.md`,
  `docs/login-flow-v2.md`, `docs/auth-flows.md`,
  `docs/troubleshooting.md`, `docs/ADR-025-*.md`: replace
  ENABLE_LOGIN_FLOW=true examples and references with
  MCP_DEPLOYMENT_MODE=login_flow.

BREAKING CHANGE: `ENABLE_LOGIN_FLOW` is no longer read from the
environment. Anyone who relied on `ENABLE_LOGIN_FLOW=true` to activate
Login Flow v2 should set `MCP_DEPLOYMENT_MODE=login_flow` instead (or
rely on it being the default when no other auth env vars are set).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-12 19:45:50 +02:00
Chris CoutinhoandClaude Opus 4.7 cafd318f36 refactor(config)!: rename OAUTH_SINGLE_AUDIENCE to LOGIN_FLOW, gate on ENABLE_LOGIN_FLOW
The AuthMode.OAUTH_SINGLE_AUDIENCE enum was a vestige of ADR-021's
original design where it co-existed with OAUTH_TOKEN_EXCHANGE. The
un-augmented OAuth bearer pass-through it represented relied on
Nextcloud-side patches to user_oidc (Bearer token validation on
non-OCS endpoints) that were never merged upstream (see
docs/authentication.md, docs/login-flow-v2.md). The working path —
mcp-login-flow profile — sets ENABLE_LOGIN_FLOW=true on top of this
mode so Login Flow v2 acquires per-user Nextcloud app passwords via
a browser flow. With OAUTH_TOKEN_EXCHANGE removed in 57303135, the
_AUDIENCE suffix in the Python name no longer disambiguates anything,
and the enum value diverged from the env-var spelling. ADR-022 (now
accepted) called for this rename as step 1 of consolidation.

- nextcloud_mcp_server/config_validators.py: rename enum to LOGIN_FLOW
  with value "login_flow". The mode_map key is now "login_flow"; the
  MODE_REQUIREMENTS entry requires `enable_login_flow=True`. Added a
  validation gate so MCP_DEPLOYMENT_MODE=login_flow without
  ENABLE_LOGIN_FLOW=true errors with a clear message pointing at
  ADR-022. Default auto-detection fallback returns LOGIN_FLOW.
- nextcloud_mcp_server/app.py: renamed three identifier references and
  switched the "Configuring MCP server for OAuth mode" log line to
  the uniform `mode.value` shape used by the other modes.
- nextcloud_mcp_server/api/management.py: renamed identifier in the
  /api/v1/status mapping. The user-visible "auth_mode": "oauth" string
  is preserved — that's a stable Astrolabe contract.
- nextcloud_mcp_server/config.py: updated Settings docstring.
- tests/unit/test_config_validators.py: renamed class
  TestOAuthSingleAudienceValidation → TestLoginFlowValidation,
  individual test methods, env-var strings; added enable_login_flow=True
  to fixtures expecting success; added a new test
  (test_login_flow_requires_enable_login_flow_flag) that exercises the
  validation gate.
- tests/unit/test_management_status_endpoint.py: renamed identifier.

BREAKING CHANGE: MCP_DEPLOYMENT_MODE=oauth_single_audience is no longer
accepted. Set MCP_DEPLOYMENT_MODE=login_flow (and keep
ENABLE_LOGIN_FLOW=true) for the same deployment. The un-augmented
OAuth path is no longer supported; if you previously ran the broken
path, you can either configure Login Flow v2 (recommended) or switch
to multi_user_basic / single_user_basic.

Dead-code pruning of `oauth_enabled and not enable_login_flow`
branches in app.py (lifespan, background sync) is deferred to a
separate follow-up PR per the consolidation plan in ADR-022.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-12 19:34:13 +02:00
Chris CoutinhoandClaude Opus 4.6 5730313574 refactor: remove RFC 8693 token exchange and Keycloak OAuth implementation
Nextcloud doesn't support OAuth bearer tokens without upstream patches,
making the RFC 8693 token exchange path untestable and dead code.

Removed:
- nextcloud_mcp_server/auth/token_exchange.py (597 lines)
- nextcloud_mcp_server/auth/keycloak_oauth.py (586 lines)
- OAUTH_TOKEN_EXCHANGE deployment mode from AuthMode enum
- get_session_client_from_context() from context_helper.py
- get_session_token() from token_broker.py
- enable_token_exchange / token_exchange_cache_ttl config fields
- oauth_token_exchange_total Prometheus metric
- Keycloak fixture block from tests/conftest.py (~408 lines)
- Token exchange unit tests from test_config_validators.py,
  test_unified_verifier.py, test_management_status_endpoint.py

Preserved:
- Multi-audience OAuth mode (OAUTH_SINGLE_AUDIENCE)
- Login Flow v2 provisioning with elicitation support
- Token broker background token management
- All existing test coverage for non-exchange paths

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-03 00:22:20 +02:00
Chris CoutinhoandClaude Opus 4.6 7956c3c061 refactor: remove Smithery deployment mode
Smithery is no longer a supported deployment mode. Remove all Smithery-specific
code paths, middleware, configuration, and tests. This simplifies the codebase
by eliminating DeploymentMode enum, SmitheryConfigMiddleware, session config
context variables, and the smithery_main entrypoint.

Files deleted: Dockerfile.smithery, smithery.yaml, smithery_main.py
ADR-016 retained with deprecated status for historical reference.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-22 20:15:47 +01:00
Chris Coutinho 056414752e fix(mcp): Move all imports to the top of modules 2025-12-26 10:05:27 -06:00
Chris CoutinhoandClaude Sonnet 4.5 4a5766b84e feat(config): enable DCR for multi-user BasicAuth with offline access
Allows multi-user BasicAuth mode to use Dynamic Client Registration (DCR)
for OAuth credentials when ENABLE_OFFLINE_ACCESS is enabled, making it
consistent with OAuth modes and reducing configuration burden.

**Changes:**

Configuration Validation:
- Relaxed OAuth credential requirements for multi-user BasicAuth
- OAuth credentials now optional when offline access enabled
- Will use DCR as fallback if NEXTCLOUD_OIDC_CLIENT_ID/SECRET not set
- Updated validation to log info instead of error when DCR will be used

Startup Logic (app.py):
- Added DCR workflow for multi-user BasicAuth before uvicorn starts
- Creates oauth_context for management APIs when offline access enabled
- Allows Astrolabe to authenticate management API calls with OAuth
- DCR runs synchronously at same lifecycle point as OAuth modes
- Added traceback import for better error logging
- Fixed type assertions for nextcloud_host
- Fixed undefined variable references in vector sync logging

Management API:
- Improved auth mode detection using proper detect_auth_mode()
- Added auth_mode field to /status endpoint:
  * "basic" - Single-user BasicAuth
  * "multi_user_basic" - Multi-user BasicAuth
  * "oauth" - OAuth modes
  * "smithery" - Smithery stateless
- Added supports_app_passwords indicator for multi-user BasicAuth

Docker Compose:
- Updated mcp-multi-user-basic service configuration:
  * Enabled vector sync (VECTOR_SYNC_ENABLED=true)
  * Added ENABLE_OFFLINE_ACCESS=true for app password support
  * Added NEXTCLOUD_MCP_SERVER_URL for Astrolabe integration
  * Documented optional static OAuth credentials

Testing:
- Updated test_config_validators.py to expect DCR fallback
- Enhanced configure_astrolabe_for_mcp_server fixture with verification
- Added debug logging to test_users_setup fixture

**Workflow:**
1. User configures ENABLE_OFFLINE_ACCESS=true
2. Server checks for static NEXTCLOUD_OIDC_CLIENT_ID/SECRET
3. If not found, performs DCR before uvicorn starts
4. DCR registers client with Nextcloud OIDC provider
5. OAuth credentials used for Astrolabe management API auth
6. Background sync can retrieve user app passwords via Astrolabe

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-22 19:43:24 +01:00
Chris CoutinhoandClaude Sonnet 4.5 1a5bb10cd0 feat(config): consolidate configuration with smart dependency resolution (ADR-021)
Simplifies configuration by consolidating overlapping settings and adding
automatic dependency resolution. This makes semantic search configuration
significantly easier for users while maintaining 100% backward compatibility.

## Key Changes

### Variable Renaming (Backward Compatible)
- `VECTOR_SYNC_ENABLED` → `ENABLE_SEMANTIC_SEARCH` (old name still works)
- `ENABLE_OFFLINE_ACCESS` → `ENABLE_BACKGROUND_OPERATIONS` (old name still works)
- Deprecation warnings logged when old names used
- Old names will be removed in v1.0.0

### Smart Dependency Resolution
- `ENABLE_SEMANTIC_SEARCH` automatically enables background operations in multi-user modes
- No need to set both `ENABLE_OFFLINE_ACCESS` and `VECTOR_SYNC_ENABLED` anymore
- Single-user mode doesn't auto-enable background ops (not needed)

### Explicit Mode Selection (Optional)
- New `MCP_DEPLOYMENT_MODE` environment variable
- Valid values: single_user_basic, multi_user_basic, oauth_single_audience,
  oauth_token_exchange, smithery
- Removes ambiguity about which deployment mode is active
- Falls back to auto-detection if not set (existing behavior)

### Configuration Templates
- Reorganized `env.sample` by deployment mode with clear sections
- Added mode-specific quick-start templates:
  - `env.sample.single-user` - Simplest configuration
  - `env.sample.oauth-multi-user` - Recommended multi-user
  - `env.sample.oauth-advanced` - Token exchange mode

## Implementation Details

### Files Modified
- `nextcloud_mcp_server/config.py` - Smart dependency resolution helpers
- `nextcloud_mcp_server/config_validators.py` - Simplified validation, explicit mode
- `tests/unit/test_config_validators.py` - 19 new tests (60 total, all passing)
- `env.sample` - Reorganized by deployment mode
- `docs/configuration.md` - Complete rewrite with consolidated approach
- `docs/troubleshooting.md` - New consolidation troubleshooting section
- `README.md` - Updated variable references

### New Files
- `docs/ADR-021-configuration-consolidation.md` - Architecture decision record
- `docs/configuration-migration-v2.md` - Comprehensive migration guide
- `env.sample.single-user` - Single-user quick-start template
- `env.sample.oauth-multi-user` - OAuth multi-user quick-start template
- `env.sample.oauth-advanced` - Token exchange quick-start template

## User Impact

### Before (Confusing)
```bash
ENABLE_OFFLINE_ACCESS=true      # Why both?
VECTOR_SYNC_ENABLED=true        # What's the relationship?
```

### After (Simplified)
```bash
MCP_DEPLOYMENT_MODE=oauth_single_audience  # Explicit (optional)
ENABLE_SEMANTIC_SEARCH=true                # Auto-enables background ops!
```

### Benefits
- 📉 2 fewer variables to understand for semantic search
- 📋 Clear intent ("I want semantic search")
- 🎯 Explicit mode declaration available
- 🔄 100% backward compatible
-  All 265 unit tests passing

## Testing
- All 60 config validation tests passing
- 10 new tests for configuration consolidation
- 9 new tests for explicit mode selection
- Full unit test suite: 265 tests passing
- Backward compatibility verified

## Migration
Users can migrate at their own pace. Old variable names continue working
with deprecation warnings. See docs/configuration-migration-v2.md for
detailed migration instructions.

Related: ADR-021

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-21 20:36:36 +01:00
Chris Coutinho 981f102b27 fix(config): address reviewer feedback
- Restore CI test filter (-m unit -m smoke) for faster CI runs
- Replace local path reference with ADR-020 reference in config_validators.py
- Add comprehensive BasicAuthMiddleware unit tests (10 tests covering all edge cases)

Addresses critical CI issue and improves test coverage for multi-user BasicAuth mode.
2025-12-20 21:16:17 +01:00
Chris CoutinhoandClaude Sonnet 4.5 4507359760 refactor(config): centralize configuration validation and simplify startup
Implement centralized configuration validation (ADR-020) to simplify
deployment mode detection and improve error messages.

Changes:
- Create ADR-020 documenting 5 deployment modes with required/optional config
- Add config_validators.py with validate_configuration() and mode detection
- Simplify app.py startup with single validation point at get_app()
- Remove duplicate is_oauth_mode() function (43 lines)
- Fix DeploymentMode mapping (only SELF_HOSTED and SMITHERY_STATELESS exist)
- Add comprehensive unit tests (41 tests covering all modes and edge cases)
- Add enable_multi_user_basic_auth to Settings and BasicAuthMiddleware

Docker Compose:
- Remove conflicting ENABLE_MULTI_USER_BASIC_AUTH from mcp-oauth service
- Add dedicated mcp-multi-user-basic service on port 8003

Test Results:
- 237/237 integration tests PASSED
- All deployment modes verified: single-user BasicAuth, multi-user BasicAuth,
  OAuth single-audience, OAuth token exchange (Keycloak), Smithery stateless

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-20 20:49:28 +01:00