feat(api): add personal API tokens and enhance webhook integration UI

- Add ApiToken model with SHA-256 hashed storage and usage tracking
- Create API token CRUD endpoints (POST/GET/DELETE /api/api-tokens/)
- Add Bearer token authentication to require_login decorator
- Exempt Bearer-authenticated requests from CSRF validation
- Add API tokens management page with create/revoke/copy UI
- Enhance webhook integration type with detailed explanation and code snippets
- Add navigation links (desktop + mobile) to API tokens page
- Include 19 tests covering CRUD, auth resolution, and utility functions
- Create migration 024_add_api_tokens

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/conftest.py

@@ -60,6 +60,7 @@ from app.main import app as fastapi_app  # noqa: E402
 
 # Import models to register them with SQLAlchemy Base
 from app.models import (  # noqa: F401, E402
+    ApiToken,
     DocumentMetadata,
     FileRecord,
     Pipeline,