fix(chat): 聊天消息预览查询条件缺失

core/routers/chat/services.py

@@ -73,6 +73,7 @@ async def get_chat_messages_preview(db_session: AsyncSession, chats):
             Message.chat_id,
             func.max(Message.created_at).label("max_created")
         )
+        .where(Message.chat_id.in_(chats))
         .group_by(Message.chat_id)
         .subquery()
     )
@@ -96,7 +97,7 @@ async def get_unread_messages_per_chat(
     """获取聊天未读消息数和消息预览"""
     messages_info_per_chat: dict[int, dict] = {chat.id: {'message_count': 0} for chat in chats}
 
-    # 未读消息数和预览
+    # 未读消息数
     unread_messages_count = await get_chat_unread_messages_count(
         db_session, login_user, messages_info_per_chat
     )
@@ -105,12 +106,8 @@ async def get_unread_messages_per_chat(
             'message_count': messages_info[1],
         }
 
-    # 已读消息预览
-    no_unread_message_chats = [
-        chat_id
-        for chat_id, message_info in messages_info_per_chat.items() if message_info.get('message') is None
-    ]
-    messages_info = await get_chat_messages_preview(db_session, no_unread_message_chats)
+    # 消息预览
+    messages_info = await get_chat_messages_preview(db_session, messages_info_per_chat)
     for message_info in messages_info:
         messages_info_per_chat[message_info.chat_id].update({
             'message': message_info