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/unit/test_config.py

@@ -5,12 +5,12 @@ from src.database import build_database_url
 
 
 @pytest.mark.unit
-def test_settings_default_database_url_uses_asyncpg() -> None:
+def test_settings_default_database_url_uses_asyncpg(monkeypatch) -> None:
     """Test that default database URL uses asyncpg driver and correct defaults."""
+    monkeypatch.delenv("DATABASE_URL", raising=False)
     settings = Settings()
-    # When DATABASE_URL env var is set (by conftest), it overrides the defaults
-    # This test verifies the URL format when built from defaults
-    expected = "postgresql+asyncpg://headquarter:headquarter@localhost:5432/headquarter"
+    # When DATABASE_URL env var is not set, the URL is built from defaults.
+    expected = "postgresql+asyncpg://headquarter:headquarter@postgres:5432/headquarter"
     assert settings.database_url == expected