Complete spec: Code alignment and documentation cleanup

- Ensure code aligns with CentralDB models
- Document code alignment with CentralDB models
- Remove informal reference documents (data-model.md, DB_API_SPEC.json, GARMINSYNC_SPEC.md)
- Run linters and formatters (black, isort, mypy)
- Update project configuration files
- Add .dockerignore for Docker builds
- Perform code formatting and import sorting
- Fix type checking issues
- Update documentation files
- Complete implementation tasks as per spec

backend/tests/unit/test_auth_service.py

@@ -3,14 +3,17 @@ from unittest.mock import AsyncMock, patch
 
 import pytest
 
-from src.schemas import TokenCreate, User
-from src.services.auth_service import AuthService
+from backend.src.models.central_db_models import User
+from backend.src.schemas import TokenCreate
+from backend.src.services.auth_service import AuthService
 
 
 @pytest.fixture
 def auth_service():
     """Fixture for AuthService with mocked CentralDBService."""
-    with patch("src.services.auth_service.CentralDBService") as MockCentralDBService:
+    with patch(
+        "backend.src.services.central_db_service.CentralDBService"
+    ) as MockCentralDBService:
         mock_central_db_instance = MockCentralDBService.return_value
         mock_central_db_instance.get_user_by_email = AsyncMock()
         mock_central_db_instance.create_user = AsyncMock()