fix bug LLM

app/llm.py

@@ -40,7 +40,7 @@ class LLMClient:
     
     def _setup_openai(self, config: Dict[str, Any]):
         """Cấu hình cho OpenAI."""
-        self.api_key = config.get("api_key") or os.getenv("OPENAI_API_KEY")
+        self.api_key = config.get("api_key") or os.getenv("OPENAI_API_KEY") or ""
         self.base_url = config.get("base_url", "https://api.openai.com/v1")
         self.model = config.get("model", "gpt-3.5-turbo")
         self.max_tokens = config.get("max_tokens", 1000)
@@ -51,17 +51,15 @@ class LLMClient:
     
     def _setup_huggingface(self, config: Dict[str, Any]):
         """Cấu hình cho HuggingFace."""
-        self.api_key = config.get("api_key") or os.getenv("HUGGINGFACE_API_KEY")
+        self.api_key = config.get("api_key", "")
         self.base_url = config.get("base_url", "https://api-inference.huggingface.co")
         self.model = config.get("model", "microsoft/DialoGPT-medium")
         self.max_tokens = config.get("max_tokens", 1000)
         self.temperature = config.get("temperature", 0.7)
-        
-        if not self.api_key:
-            raise ValueError("HuggingFace API key is required")
     
     def _setup_local(self, config: Dict[str, Any]):
         """Cấu hình cho local model."""
+        self.api_key = ""
         self.base_url = config.get("base_url", "http://localhost:8000")
         self.model = config.get("model", "default")
         self.max_tokens = config.get("max_tokens", 1000)
@@ -69,11 +67,13 @@ class LLMClient:
     
     def _setup_custom(self, config: Dict[str, Any]):
         """Cấu hình cho custom provider."""
+        self.api_key = config.get("api_key", "")
         self.base_url = config.get("base_url")
-        self.api_key = config.get("api_key")
         self.model = config.get("model", "default")
         self.max_tokens = config.get("max_tokens", 1000)
         self.temperature = config.get("temperature", 0.7)
+        if not self.base_url:
+            raise ValueError("Custom provider requires base_url")
 
     def _setup_HFS(self, config: Dict[str, Any]):
         """Cấu hình cho custom provider."""