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_ssh_keys.py

@@ -6,13 +6,13 @@ from unittest.mock import MagicMock, patch
 
 import pytest
 
-from src.services.ssh_keys import prepare_ssh_key_files
+from src.services.shared.ssh_keys import prepare_ssh_key_files
 
 
 class TestPrepareSshKeyFiles:
     """Tests for prepare_ssh_key_files."""
 
-    @patch("src.services.ssh_keys._get_fernet")
+    @patch("src.services.shared.ssh_keys._get_fernet")
     def test_creates_files_with_default_permissions(
         self, mock_fernet, tmp_path
     ) -> None:
@@ -29,7 +29,7 @@ class TestPrepareSshKeyFiles:
         assert (Path(ssh_dir) / "config").exists()
         assert oct(os.stat(Path(ssh_dir) / "id_ed25519").st_mode)[-3:] == "600"
 
-    @patch("src.services.ssh_keys._get_fernet")
+    @patch("src.services.shared.ssh_keys._get_fernet")
     def test_sets_ownership_when_uid_gid_provided(self, mock_fernet, tmp_path) -> None:
         mock_fernet.return_value.decrypt.return_value = b"private-key-content"
         ssh_key = MagicMock()
@@ -45,7 +45,7 @@ class TestPrepareSshKeyFiles:
         assert mock_chown.call_args_list[0][0][1] == 1001
         assert mock_chown.call_args_list[0][0][2] == 1001
 
-    @patch("src.services.ssh_keys._get_fernet")
+    @patch("src.services.shared.ssh_keys._get_fernet")
     def test_gracefully_handles_permission_error_on_chown(
         self, mock_fernet, tmp_path
     ) -> None: