docs: fix scope naming and round-3 reviewer feedback

The docs claimed scopes are mcp:-prefixed (mcp:notes.read,
mcp:notes.write) and that the notes.* pair "covers all Nextcloud
apps". Both are false. Per @require_scopes decorators across
nextcloud_mcp_server/server/, scopes are unprefixed and per-app:
notes.read/write, talk.read/write, files.read/write,
calendar.read/write, contacts.read/write, deck.read/write,
news.read, tables.read/write, cookbook.read/write,
todo.read/write, collectives.read/write, sharing.write,
semantic.read, plus standard OIDC scopes.

Changes:

- login-flow-v2.md: replace the false 2-row "covers all apps"
  scope table with the real per-app reference (links to
  scope_authorization.discover_all_scopes() as authoritative
  source); strip mcp: prefix from intro paragraph, sequence
  diagrams, @require_scopes example, WWW-Authenticate header
  example. Also fix sticky-session keying advice per reviewer:
  route on user identity (sub claim) rather than the raw bearer
  token, since tokens rotate on refresh.
- auth-flows.md: clarify "Astrolabe (hosted UI) → MCP" matrix
  column header; strip mcp: from sequence diagram and key
  characteristics bullet; correct "issued by MCP server" to
  "issued by configured IdP" on the Login Flow v2 token.
- authentication.md: strip mcp: from the high-level diagram and
  scope-enforcement prose; cross-link to the scope reference.
- configuration.md: add NEXTCLOUD_OIDC_CLIENT_ID,
  NEXTCLOUD_OIDC_CLIENT_SECRET, and OIDC_DISCOVERY_URL to the
  Login Flow v2 vars table — these were undocumented in the
  table after the round-2 multi-IdP fix.
- running.md: drop deprecated `version: '3.8'` from compose
  snippets (Compose v2 ignores it and emits warnings).
- testing-oidc-consent.md: fix sample authorize URL and consent
  description to use real scope names instead of mcp:-prefixed
  ones (the manual test as written would have failed with
  invalid_scope).
- CLAUDE.md: replace dead links to deleted oauth-architecture.md,
  oauth-setup.md, and audience-validation-setup.md with
  login-flow-v2.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -300,7 +300,7 @@ Use `scripts/sqlitequery.py` for all SQLite queries:
 
 **For detailed architecture, see:**
 - `docs/comparison-context-agent.md` - Overall architecture
-- `docs/oauth-architecture.md` - OAuth integration patterns
+- `docs/login-flow-v2.md` - OAuth/OIDC integration patterns and architecture
 - `docs/ADR-004-progressive-consent.md` - Progressive consent implementation
 
 **Core Components**:
@@ -509,9 +509,8 @@ docker compose exec app php occ user_oidc:provider keycloak
 **Credentials**: admin/admin (Keycloak realm: `nextcloud-mcp`)
 
 **For detailed Keycloak setup, see**:
-- `docs/oauth-setup.md` - OAuth configuration
+- `docs/login-flow-v2.md` - OAuth/OIDC configuration (set `OIDC_DISCOVERY_URL` to a Keycloak realm)
 - `docs/ADR-002-vector-sync-authentication.md` - Offline access architecture
-- `docs/audience-validation-setup.md` - Token audience validation
 - `docs/keycloak-multi-client-validation.md` - Realm-level validation
 
 ## Integration Testing with Docker