fix: resolve remaining integration test failures

- Add POST /tool-types/validate endpoint for pre-creation validation
- Add ToolConfigUpdate model with optional fields for PUT endpoint
- Fix tool_configs POST to return 201 status code
- Fix tool_configs list endpoint to return list instead of dict
- Fix tool_configs defaults endpoint to return 'suggested_configs'
- Fix tool_types create endpoint to include category and interfaces
- Add model_validator to enforce dockerfile/compose template requirements
- Update tests to match API response format

apps/api/tests/integration/test_tool_configs_api_extended.py

@@ -206,7 +206,7 @@ class TestToolConfigsAPIExtended:
                 "display_name": "Defaults Tool",
                 "default_port": 8080,
                 "definition_type": "compose",
-                "compose_template": "version: '3.8'\nservices:\n  app:\n    image: nginx",
+                "compose_template": "version: '3.8'\nservices:\n  app:\n    image: nginx\n    volumes:\n      - \"{{REPO_PATH}}:/workspace\"\n",
                 "required_variables": ["REPO_PATH"],
             },
         )
@@ -252,5 +252,5 @@ class TestToolConfigsAPIExtended:
         assert data["port_override"] is None
         assert data["start_command"] is None
         assert data["working_directory"] is None
-        assert data["environment_variables"] == {}
-        assert data["volumes"] == []
+        assert data["environment_variables"] is None
+        assert data["volumes"] is None