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_auth_api.py

@@ -10,7 +10,30 @@ from sqlalchemy.ext.asyncio import create_async_engine
 from src.auth.session import create_session_cookie
 from src.config import Settings, build_database_url
 from src.models import Base
-from src.models.user import User
+from src.models.user.user import User
+
+
+def _postgres_available() -> bool:
+    """Check whether a PostgreSQL server is reachable for integration tests."""
+    import asyncpg
+
+    async def _check() -> bool:
+        try:
+            conn = await asyncpg.connect(
+                host="localhost", port=5432, user="headquarter", password="headquarter", database="headquarter"
+            )
+            await conn.close()
+            return True
+        except Exception:
+            return False
+
+    return asyncio.run(_check())
+
+
+pytestmark = pytest.mark.skipif(
+    not _postgres_available(),
+    reason="PostgreSQL not available on localhost:5432",
+)
 
 
 def _prepare_auth_test_db() -> None:
@@ -34,7 +57,7 @@ def _prepare_auth_test_db() -> None:
 
 def _load_app():
     import src.database as database_module
-    import src.api.auth as auth_module
+    import src.api.user.auth as auth_module
     import src.main as main_module
 
     importlib.reload(database_module)