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_profile_resolver.py

@@ -2,8 +2,8 @@ import uuid
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from src.models.config_profile import ConfigProfile, ConfigProfileInclude
-from src.services.config_profile_resolver import (
+from src.models.config.config_profile import ConfigProfile, ConfigProfileInclude
+from src.services.config.config_profile_resolver import (
     ConfigProfileCycleError,
     ConfigProfileNotFoundError,
     ResolvedMount,
@@ -77,7 +77,7 @@ class TestMergeFunctions:
 
     def test_merge_mounts_file_override(self) -> None:
         """Test mount file map merging with overrides."""
-        from src.services.config_profile_resolver import ResolvedMount
+        from src.services.config.config_profile_resolver import ResolvedMount
 
         result = _merge_mounts(
             {"/app": ResolvedMount(target="/app", mode="rw", files={"a.txt": "old"})},
@@ -89,7 +89,7 @@ class TestMergeFunctions:
 
     def test_merge_mounts_mode_conflict(self) -> None:
         """Test that mount mode conflicts are resolved (later wins)."""
-        from src.services.config_profile_resolver import ResolvedMount
+        from src.services.config.config_profile_resolver import ResolvedMount
 
         overrides = {}
         result = _merge_mounts(