feat：增加了reply_to新message属性，优化prompt，切割

src/common/database/database_model.py

@@ -126,6 +126,8 @@ class Messages(BaseModel):
     time = DoubleField()  # 消息时间戳
 
     chat_id = TextField(index=True)  # 对应的 ChatStreams stream_id
+    
+    reply_to = TextField(null=True)
 
     # 从 chat_info 扁平化而来的字段
     chat_info_stream_id = TextField()