feat: add Alembic database migration system

Implements Alembic for managing token storage database schema versions.
Migrations run automatically on startup with full backward compatibility.

**Changes:**
- Add Alembic dependency (1.14.0+) and SQLAlchemy (auto-installed)
- Create migration infrastructure in alembic/ directory
- Add initial migration (001) capturing current schema
- Modify RefreshTokenStorage.initialize() to run migrations via anyio
- Add CLI commands: db upgrade, current, history, downgrade, migrate
- Add comprehensive migration documentation

**Backward Compatibility:**
- Pre-Alembic databases automatically stamped with revision 001
- No schema changes for existing databases
- Automatic upgrade on first startup after update

**Migration Strategy:**
Three scenarios handled:
1. New database → Run migrations from scratch
2. Pre-Alembic database → Stamp with 001 (no changes)
3. Alembic-managed → Upgrade to latest

**Architecture:**
- Uses anyio.to_thread.run_sync() for structured concurrency
- Alembic env.py runs with anyio.run() in worker thread
- SQLite-friendly migration patterns documented
- No ThreadPoolExecutor needed (anyio handles it)

**CLI Usage:**
```bash
nextcloud-mcp-server db upgrade    # Upgrade to latest
nextcloud-mcp-server db current    # Show version
nextcloud-mcp-server db history    # View changelog
nextcloud-mcp-server db downgrade  # Rollback (with confirmation)
nextcloud-mcp-server db migrate "description"  # Create migration
```

**Testing:**
- All 13 webhook storage tests pass
- New/pre-Alembic database scenarios validated
- anyio integration tested

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -20,6 +20,7 @@ dependencies = [
     "caldav",
     "pyjwt[crypto]>=2.8.0",
     "aiosqlite>=0.20.0", # Async SQLite for refresh token storage
+    "alembic>=1.14.0", # Database migrations
     "authlib>=1.6.5",
     "qdrant-client>=1.7.0",
     "fastembed>=0.7.3", # BM25 sparse vector embeddings for hybrid search
@@ -128,7 +129,7 @@ dev = [
 ]
 
 [project.scripts]
-nextcloud-mcp-server = "nextcloud_mcp_server.cli:run"
+nextcloud-mcp-server = "nextcloud_mcp_server.cli:cli"
 smithery-main = "nextcloud_mcp_server.smithery_main:main"
 
 [[tool.uv.index]]