feat: implement mobile scan terminal dashboard and city picker with backend forum automation scripts

frontend/components/account/AccountCenter.tsx

@@ -219,6 +219,7 @@ const TELEGRAM_BOT_URL = String(
   process.env.NEXT_PUBLIC_TELEGRAM_BOT_URL || "https://t.me/WeatherQuant_bot",
 ).trim();
 const TELEGRAM_MARKET_CHANNEL_URL = "https://t.me/+hGAk7JsjtdhiOTUx";
+const TELEGRAM_TOPICS_GROUP_URL = "https://t.me/+8vel7rwjZagxODUx";
 const SUBSCRIPTION_HELP_HREF = "/subscription-help";
 const PAYMENT_RECOVERY_STORAGE_KEY = "polyweather:lastPaymentRecovery";
 const PAYMENT_RECOVERY_TTL_MS = 6 * 60 * 60 * 1000;
@@ -708,6 +709,16 @@ export function AccountCenter() {
       telegramHint: isEn
         ? "Send the command below to the polyweather bot to sync notifications and access."
         : "将下方命令发送给polyweather机器人，实现全平台气象查询与权限同步。",
+      telegramUpgradeTitle: isEn
+        ? "Channel Upgrade: New Topics Group Live"
+        : "频道升级通知：新话题群组已上线",
+      telegramUpgradeBody: isEn
+        ? "Real-time airport temperature pushes are migrating to the new PolyWeather Topics group, organized by city for better tracking. Current channel will stop updating and be deleted in 3 days — please join the new group now."
+        : "为了更好地按城市分类推送，后续实时机场温度推送将迁移至新的 PolyWeather Topics 群组。当前频道将在 3 天后停止更新并删除，请及时迁移。",
+      telegramUpgradeFeatures: isEn
+        ? "Independent city topics:"
+        : "支持独立城市话题订阅：",
+      telegramUpgradeJoin: isEn ? "Join New Group" : "加入新群",
       paymentManualSupport: isEn
         ? "If payment succeeds but Pro is still not activated, email yhrsc30@gmail.com. This project is currently maintained by one developer, so manual recovery may be needed in edge cases."
         : "如果付款成功后 Pro 仍未开通，请发邮件到 yhrsc30@gmail.com。当前项目由我一人维护，极少数边缘情况可能需要人工补开。给你带来的不便，敬请谅解！",
@@ -2755,6 +2766,34 @@ export function AccountCenter() {
                 <p className="text-slate-400 text-sm mb-6">
                   {copy.telegramHint}
                 </p>
+
+                {/* Channel Upgrade / Migration Notice — Pro users only */}
+                {isSubscribed ? (
+                  <div className="mb-6 rounded-2xl border border-cyan-400/30 bg-gradient-to-br from-cyan-500/12 to-blue-500/8 px-5 py-4">
+                    <h4 className="text-sm font-bold text-cyan-300 mb-2 flex items-center gap-1.5">
+                      <Sparkles size={15} /> {copy.telegramUpgradeTitle}
+                    </h4>
+                    <p className="text-slate-300 text-xs leading-relaxed mb-3">
+                      {copy.telegramUpgradeBody}
+                    </p>
+                    <p className="text-slate-400 text-[11px] font-semibold mb-1.5">
+                      {copy.telegramUpgradeFeatures}
+                    </p>
+                    <p className="text-slate-300 text-xs leading-relaxed mb-3">
+                      🇯🇵 Tokyo · 🇰🇷 Seoul · 🇰🇷 Busan · 🇨🇳 Beijing · 🇨🇳 Shanghai · 🇨🇳 Guangzhou · 🇨🇳 Chengdu · 🇨🇳 Wuhan · 🇭🇰 Hong Kong · 🇹🇼 Taipei · 🇸🇬 Singapore · 🇹🇷 Istanbul · 🇫🇮 Helsinki · 🇳🇱 Amsterdam · 🇫🇷 Paris · 🇺🇸 New York · 🇺🇸 Los Angeles · 🇺🇸 Chicago
+                    </p>
+                    <Link
+                      href={TELEGRAM_TOPICS_GROUP_URL}
+                      target="_blank"
+                      rel="noreferrer"
+                      className="inline-flex min-h-9 items-center gap-1.5 rounded-lg border border-cyan-400/40 bg-cyan-500/15 px-4 py-2 text-xs font-bold text-cyan-200 hover:bg-cyan-500/25 transition-colors"
+                    >
+                      {copy.telegramUpgradeJoin}
+                      <ExternalLink size={12} />
+                    </Link>
+                  </div>
+                ) : null}
+
                 <div className="mb-4 flex flex-wrap gap-2">
                   {TELEGRAM_BOT_URL ? (
                     <Link