backend: 添加token验证功能，重构用户登录逻辑，优化消息发送与接收

utils/auth.js

@@ -0,0 +1,15 @@
+import axios from "axios"
+
+var apiUrl = "https://www.cloudy233.top:6699/bearer";
+
+class Resp {
+    constructor(success, message, data = null) {
+        this.success = success
+        this.message = message
+        this.data = data
+    }
+}
+
+export function verifyToken(token) {
+    return axios.get(apiUrl, {headers: {Authorization: "Bearer " + token}})
+}