fix bug LLM

app/llm.py

@@ -222,21 +222,25 @@ class LLMClient:
         """Generate text với HFS provider."""
         endpoint = f"{self.base_url}/purechat"
         payload = {"prompt": prompt}
-        logger.info(f"[LLM] _generate_hfs - endpoint: {endpoint}, payload: {payload}")
+        logger.info(f"[LLM][FLOW] Chuẩn bị gửi request tới HFS endpoint: {endpoint}")
+        logger.info(f"[LLM][FLOW] Payload gửi đi: {payload}")
         headers = {}
         if self.api_key:
             headers["Authorization"] = f"Bearer {self.api_key}"
-        response = await self._client.post(endpoint, headers=headers, json=payload)
-        logger.info(f"[LLM] _generate_hfs - response status: {response.status_code}")
-        response.raise_for_status()
-        data = response.json()
-        logger.info(f"[LLM] _generate_hfs - response data: {data}")
-        # Giả sử response là {'result': '...'} hoặc {'data': ['...']}
-        if 'result' in data:
-            return data['result']
-        elif 'data' in data and isinstance(data['data'], list):
-            return data['data'][0]
-        return str(data)
+        try:
+            response = await self._client.post(endpoint, headers=headers, json=payload)
+            logger.info(f"[LLM][FLOW] Đã nhận response từ HFS, status: {response.status_code}")
+            response.raise_for_status()
+            data = response.json()
+            logger.info(f"[LLM][FLOW] Response data: {data}")
+            if 'result' in data:
+                return data['result']
+            elif 'data' in data and isinstance(data['data'], list):
+                return data['data'][0]
+            return str(data)
+        except Exception as e:
+            logger.error(f"[LLM][FLOW][ERROR] Lỗi khi gọi HFS endpoint: {endpoint} | Exception: {e}")
+            raise
 
     @timing_decorator_async
     async def chat(