fix: resolve stale backend test imports and schema drift

- Delete 4 obsolete unit tests tied to removed git mount/clone models
- Update imports and assertions across unit/integration/service tests
- Fix Settings defaults (postgres host, JWT props, cookie_samesite)
- Add skip guards for PostgreSQL-dependent integration tests
- Fix GitService env assertions and HealthMonitor state-change tests
- Repair docker/container inspect assertions in test_docker_service
- Fix ToolTypeCreate default_port validator ordering bug
- Fix check_port_exposed substring false-positive for port 0
- Update test_tool_types_api_extended to use interface_type field

Quality gates: pytest 311 passed, 34 skipped; npm typecheck/lint/test 87 passed

apps/api/tests/integration/test_models.py

@@ -3,11 +3,11 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from src.models import Base
 from src.models.base import TimestampMixin, UUIDPrimaryKeyMixin
-from src.models.git_repository import GitRepository
-from src.models.project import Project
-from src.models.ssh_key import SSHKey
-from src.models.user import User
-from src.models.user_config import UserConfig
+from src.models.project.git_repository import GitRepository
+from src.models.project.project import Project
+from src.models.user.ssh_key import SSHKey
+from src.models.user.user import User
+from src.models.user.user_config import UserConfig
 
 
 @pytest.mark.integration
@@ -39,6 +39,7 @@ def test_expected_tables_are_registered() -> None:
         "tool_types",
         "user_configs",
         "users",
+        "workspaces",
     }