feat: add TV Quick Connect to connection page for Android TV / Apple TV

When user selects Android TV or Apple TV platform (from non-TV device),
shows 5-char code input + QR scanner to send subscription to TV via
Happ TV API. Hybrid QR strategy: native Telegram scanner on mobile,
html5-qrcode CDN fallback on desktop. i18n keys for ru/en/zh/fa.

Based on PR #415 by @smediainfo.

src/locales/zh.json

@@ -472,6 +472,20 @@
       "resumeBtn": "恢复",
       "title": "暂停订阅",
       "willBeCharged": "将扣费"
+    },
+    "tvQuickConnect": {
+      "title": "连接电视",
+      "description": "输入电视屏幕上显示的5位代码",
+      "sendBtn": "发送到电视",
+      "badCode": "请输入5位代码（字母和数字）",
+      "sent": "已发送到电视！",
+      "error": "发送到电视失败",
+      "scanTitle": "扫描二维码",
+      "scanDescription": "扫描电视屏幕上的二维码",
+      "scanBtn": "扫描电视二维码",
+      "stopScan": "关闭摄像头",
+      "noCamera": "无法访问摄像头",
+      "codeFound": "找到代码"
     }
   },
   "balance": {