fix: defer mini program phone auth until login

src/components/auth/LoginScreen.tsx

@@ -7,6 +7,9 @@ import type {
   AuthLoginMethod,
 } from '../../services/authService';
 import { getStoredLastLoginPhone } from '../../services/authService';
+import {
+  isWechatMiniProgramWebViewRuntime,
+} from '../../services/authService';
 import { LegalDocumentModal } from '../common/LegalDocumentModal';
 import {
   getLegalDocument,
@@ -83,6 +86,7 @@ export function LoginScreen({
   const passwordLoginEnabled = true;
   const phoneLoginEnabled = true;
   const wechatLoginEnabled = availableLoginMethods.includes('wechat');
+  const miniProgramRuntime = isWechatMiniProgramWebViewRuntime();
   const [activeLoginTab, setActiveLoginTab] = useState<LoginTab>('phone');
 
   useEffect(() => {
@@ -317,7 +321,7 @@ export function LoginScreen({
                   </button>
                 </div>
 
-                {wechatLoginEnabled ? (
+                {wechatLoginEnabled && !miniProgramRuntime ? (
                   <WechatButton
                     loading={wechatLoading}
                     disabled={submitDisabled}
@@ -364,7 +368,8 @@ export function LoginScreen({
 
             {!passwordLoginEnabled &&
             !phoneLoginEnabled &&
-            !wechatLoginEnabled ? (
+            !wechatLoginEnabled &&
+            !miniProgramRuntime ? (
               <div className="platform-subpanel rounded-2xl px-4 py-4 text-sm text-[var(--platform-text-base)]">
                 当前登录入口暂不可用。
               </div>