Fix missing os import and duplicate attributes in models/manager.py

codai/models/manager.py

 """Model manager module - contains ModelManager, WhisperServerManager, and MultiModelManager classes."""
 
 from typing import Optional, Dict, Any, List
+import os
 import subprocess
 import signal
 import requests
@@ -382,9 +383,6 @@ class MultiModelManager:
         self.config: Dict[str, Dict] = {}  # Store model configurations
         self.tool_parser = ModelParserAdapter()
         self.current_model_key: Optional[str] = None
-        self.config: Dict[str, Dict] = {}  # Store model configurations
-        self.tool_parser = ModelParserAdapter()
-        self.current_model_key: Optional[str] = None
         self.load_mode: str = "ondemand"
         self.active_in_vram: Optional[str] = None
         self.model_aliases: Dict[str, str] = {}