update:优化了websocket对数据库连接的获取与释放

app/abstract.py

@@ -10,7 +10,7 @@ class ASR(ABC):
 
 class LLM(ABC):
     @abstractmethod
-    def chat(self, assistant, prompt, db):
+    def chat(self, assistant, prompt):
         pass
 
 class TTS(ABC):