fix(auth): transfer WeChat id on merge; stop false phone prompts

Merge used to drop wxOpenId so OAuth created a new guest without phone every time. Now migrate WeChat identity, recover legacy merged openIds, return accountMerged and force page reload, and only soft-prompt when phone is truly unbound.

apps/mini-user/src/components/WechatShareBootstrap.tsx

@@ -1,7 +1,7 @@
 import Taro from '@tarojs/taro';
 import { captureIosJssdkEntryUrl } from '@dukang/weixin-sdk';
 import { useEffect, useRef } from 'react';
-import { finishLoginNavigate, goLogin } from '../lib/auth-nav';
+import { finishLoginNavigate, forceReloadAfterAccountMerge, goLogin } from '../lib/auth-nav';
 import { toast } from '../lib/api';
 import { saveWechatLoginResult } from '../lib/pay-wechat';
 import { applyWechatShare } from '../lib/wechat-share';
@@ -70,11 +70,16 @@ export default function WechatShareBootstrap() {
           if (!result) return;
           if (saveWechatLoginResult(result)) {
             toast('微信授权成功', 'success');
+            const ret = returnFromLogin || params.get('return') || undefined;
+            if (result.accountMerged) {
+              forceReloadAfterAccountMerge(ret);
+              return;
+            }
             if (
               returnFromLogin !== undefined ||
               currentPagePathWithQuery().includes('/pages/login/')
             ) {
-              finishLoginNavigate(returnFromLogin || params.get('return') || undefined);
+              finishLoginNavigate(ret);
             }
             return;
           }