feat: custom title and set history top

src/pages/api/chat/saveChat.ts

@@ -77,15 +77,13 @@ export async function saveChat({
     });
     return _id;
   } else {
-    // 已经有记录，追加入库
-    const chat = await Chat.findById(chatId);
     await Chat.findByIdAndUpdate(chatId, {
       $push: {
         content: {
           $each: content
         }
       },
-      ...(chat && !chat.customTitle ? { title: content[0].value.slice(0, 20) } : {}),
+      title: content[0].value.slice(0, 20),
       latestChat: content[1].value,
       updateTime: new Date()
     });