fix: 无 openid 不再 devLogin 共享账号，改为微信授权引导页（requireAuth）

frontend/src/app/pages/LoginPage.tsx

@@ -3,13 +3,15 @@ import { useNavigate } from "react-router";
 import { motion } from "motion/react";
 import { Heart } from "lucide-react";
 import { useUser } from "../context/UserContext";
-import { devLogin, fetchApi, getToken, clearToken, decodeToken } from "../services/api";
+import { fetchApi, getToken, clearToken, decodeToken } from "../services/api";
 import { debugLog, clearDebugLogs } from "../services/debug";
+import bridge from "../services/bridge";
 
 export function LoginPage() {
   const navigate = useNavigate();
   const { setTokenAndUser, fetchProfile } = useUser();
   const [error, setError] = useState("");
+  const [needAuth, setNeedAuth] = useState(false);
   const { addDebug, debugInfo } = useUser();
 
   useEffect(() => {
@@ -78,23 +80,13 @@ export function LoginPage() {
       return;
     }
 
-    addDebug(`no openid, fallback to dev-login`);
+    addDebug(`no openid, 显示授权引导（不再 devLogin 共享账号）`);
-    devLogin().then((res) => {
+    setNeedAuth(true);
-      debugLog(`dev-login: openid=${res.openid}, phone=${res.mobile}`);
-      setTokenAndUser(res.token, { id: res.user_id, openid: res.openid, phone: res.mobile });
-      fetchProfile().then((dto) => {
-        if (dto) debugLog(`fetchProfile: name=${dto.name}, phone=${dto.phone}`);
-        navigate(dto?.is_onboarded ? "/home" : "/onboarding", { replace: true });
-      });
-    }).catch((err) => {
-      debugLog(`dev-login error: ${err?.message}`);
-      setError(err?.message || "登录失败，请刷新重试");
-    });
   }, []); // eslint-disable-line react-hooks/exhaustive-deps
 
   return (
     <div className="min-h-dvh bg-morandi-50 flex items-center justify-center p-4 relative">
-      <div className="text-center">
+      <div className="text-center max-w-sm w-full">
         <motion.div
           animate={{ rotate: 360 }}
           transition={{ repeat: Infinity, duration: 1.5, ease: "linear" }}
@@ -102,7 +94,18 @@ export function LoginPage() {
         >
           <Heart className="w-8 h-8 text-white fill-white" />
         </motion.div>
-        {error ? (
+        {needAuth ? (
+          <div>
+            <p className="text-sm text-gray-700 mb-1">需要微信授权才能使用完整功能</p>
+            <p className="text-xs text-gray-400 mb-4">请在微信小程序中点击下方按钮完成授权</p>
+            <button
+              onClick={() => bridge.requireAuth()}
+              className="w-full py-2.5 rounded-full bg-morandi-400 text-white text-sm font-medium"
+            >
+              微信授权登录
+            </button>
+          </div>
+        ) : error ? (
           <p className="text-sm text-red-500">{error}</p>
         ) : (
           <p className="text-sm text-gray-500">加载中...</p>