fix: resolve CI/CD workflow and linting issues

src/mcp_server_cli/config.py

@@ -2,16 +2,13 @@
 
 import os
 from pathlib import Path
-from typing import Dict, Optional, Any
+from typing import Any, Dict, Optional
+
 import yaml
 from pydantic import ValidationError
 
 from mcp_server_cli.models import (
     AppConfig,
-    ServerConfig,
-    LocalLLMConfig,
-    SecurityConfig,
-    ToolConfig,
 )