feat(h5): 小程序 embed 模式与全站 ICP 备案页脚

H5 支持 ?mp=1 嵌入微信 WebView；user-h5/admin-h5 底部展示蜀ICP备2025140386号-2 并链至工信部；补充小程序+H5 部署说明。

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

apps/user-h5/src/lib/mpEmbed.ts

@@ -0,0 +1,17 @@
+const MP_EMBED_KEY = 'yxg_mp_embed'
+const MP_QUERY = 'mp'
+
+/** Persist ?mp=1 from mini-program web-view entry. Call once before router mount. */
+export function initMpEmbed(): void {
+  if (typeof window === 'undefined') return
+  const params = new URLSearchParams(window.location.search)
+  if (params.get(MP_QUERY) === '1') {
+    sessionStorage.setItem(MP_EMBED_KEY, '1')
+  }
+}
+
+/** True when H5 runs inside WeChat mini-program web-view (no H5 tab bar). */
+export function isMpEmbed(): boolean {
+  if (typeof window === 'undefined') return false
+  return sessionStorage.getItem(MP_EMBED_KEY) === '1'
+}