feat: 更新认证逻辑，支持通过openid查找或创建用户，并调整JWT负载字段

frontend/src/app/pages/LoginPage.tsx

@@ -27,9 +27,9 @@ export function LoginPage() {
       if (tokenFromUrl !== oldToken) {
         const payload = decodeToken(tokenFromUrl);
         setTokenAndUser(tokenFromUrl, {
-          id: payload.sub,
+          id: String(payload.uid),
           openid: payload.openid,
-          phone: payload.mobile,
+          phone: payload.phone,
         });
       } else {
         // token 没变，确保 localStorage 有数据