增加 获取未读消息的接口

app/api/endpoints/message.py

@@ -15,7 +15,7 @@ async def create_message(
     db: Session = Depends(get_db),
     admin: UserDB = Depends(get_admin_user)  # 仅管理员可创建消息
 ):
-    """创建消息"""
+    """创建消息 （仅管理员）"""
     db_message = MessageDB(**message.model_dump())
     
     try:
@@ -87,3 +87,21 @@ async def get_user_messages(
         "total": total,
         "items": [MessageInfo.model_validate(m) for m in messages]
     })
+
+@router.get("/latest-unread", response_model=ResponseModel)
+async def get_latest_unread_message(
+    db: Session = Depends(get_db),
+    current_user: UserDB = Depends(get_current_user)
+):
+    """获取最新一条未读消息"""
+    message = db.query(MessageDB).filter(
+        MessageDB.user_id == current_user.userid,
+        MessageDB.is_read == False
+    ).order_by(
+        MessageDB.create_time.desc()
+    ).first()
+    
+    if not message:
+        return success_response(data=None)
+    
+    return success_response(data=MessageInfo.model_validate(message))