fix(weixin-sdk): restore iOS JSSDK entry-URL signing for shop scan

Phone re-login + OAuth on iOS left SPA on a different path than the WebView entry URL, so scanQRCode failed until a full reopen. Sign with the document entry URL again and warm up after auth.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/h5-shop/src/lib/shop-scan-auth.ts

@@ -3,6 +3,9 @@ import { isIosDevice } from '@dukang/weixin-sdk';
 /** 扫码前发起 OAuth 时标记，回跳后在首页续扫 */
 export const SHOP_PENDING_SCAN_KEY = 'shop_pending_scan';
 
+/** 短信登录后绑定微信等 OAuth 回跳：下次手动扫码加长预热（不自动打开相机） */
+export const SHOP_SCAN_WARMUP_KEY = 'shop_scan_warmup';
+
 export function markPendingScanAfterAuth(): void {
   try {
     sessionStorage.setItem(SHOP_PENDING_SCAN_KEY, '1');
@@ -27,6 +30,25 @@ export function clearPendingScanAfterAuth(): void {
   }
 }
 
+/** OAuth（含短信登录后绑微信）回跳后，标记下一次扫码需要加长预热 */
+export function markScanWarmupAfterAuth(): void {
+  try {
+    sessionStorage.setItem(SHOP_SCAN_WARMUP_KEY, '1');
+  } catch {
+    /* ignore */
+  }
+}
+
+export function consumeScanWarmupAfterAuth(): boolean {
+  try {
+    if (sessionStorage.getItem(SHOP_SCAN_WARMUP_KEY) !== '1') return false;
+    sessionStorage.removeItem(SHOP_SCAN_WARMUP_KEY);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 /** OAuth 回跳后延迟再调 scanQRCode（iOS JSSDK 离线校验更慢） */
 export function getPostAuthScanDelayMs(): number {
   return isIosDevice() ? 1200 : 600;