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/src/config.py

@@ -47,6 +47,11 @@ class Settings(BaseSettings):
     session_secret: str = "change-me-session-secret"
     session_ttl_hours: int = 24
 
+    # Internal JWT configuration (used for service-to-service tokens)
+    jwt_algorithm: str = "HS256"
+    access_token_ttl_minutes: int = 15
+    refresh_token_ttl_days: int = 7
+
     # Repository storage
     repo_base_path: str = "/data/repos"
     
@@ -122,7 +127,7 @@ class Settings(BaseSettings):
     @property
     def cookie_samesite(self) -> str:
         if self.app_env == "production":
-            return "none"
+            return "strict"
 
         return "lax"