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_home_path_expansion.py

@@ -2,9 +2,8 @@
 
 import pytest
 
-from src.api.tool_instances import _resolve_git_mount_mappings
-from src.services.config_profile_resolver import expand_container_path
-from src.services.manifest_compiler import get_manifest_home_dir
+from src.services.config.config_profile_resolver import expand_container_path
+from src.services.build.manifest_compiler import get_manifest_home_dir
 
 
 class TestExpandContainerPath:
@@ -75,36 +74,3 @@ class TestGetManifestHomeDir:
         manifest = {"user": {"name": None, "uid": 1000, "gid": 1000}}
         assert get_manifest_home_dir(manifest) == "/root"
 
-
-class TestResolveGitMountMappingsExpansion:
-    """Tests that git mount mapping targets expand ~ and $HOME."""
-
-    def test_tilde_target_expansion(self, tmp_path) -> None:
-        """Mapping with ~/repo target expands to home dir."""
-        (tmp_path / "src").mkdir()
-        mappings = [{"source_path": "src", "target_path": "~/repo"}]
-        result = _resolve_git_mount_mappings(
-            str(tmp_path), mappings, None, "/home/user"
-        )
-        assert len(result) == 1
-        assert result[0]["target"] == "/home/user/repo"
-
-    def test_dollar_home_target_expansion(self, tmp_path) -> None:
-        """Mapping with $HOME/repo target expands to home dir."""
-        (tmp_path / "src").mkdir()
-        mappings = [{"source_path": "src", "target_path": "$HOME/repo"}]
-        result = _resolve_git_mount_mappings(
-            str(tmp_path), mappings, None, "/home/user"
-        )
-        assert len(result) == 1
-        assert result[0]["target"] == "/home/user/repo"
-
-    def test_absolute_target_unchanged(self, tmp_path) -> None:
-        """Absolute target paths are not modified."""
-        (tmp_path / "src").mkdir()
-        mappings = [{"source_path": "src", "target_path": "/app/src"}]
-        result = _resolve_git_mount_mappings(
-            str(tmp_path), mappings, None, "/home/user"
-        )
-        assert len(result) == 1
-        assert result[0]["target"] == "/app/src"