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/en.json

@@ -593,6 +593,20 @@
       "label": "Traffic",
       "selectVolume": "Select traffic volume",
       "default": "Default: {{label}}"
+    },
+    "tvQuickConnect": {
+      "title": "Connect TV",
+      "description": "Enter the 5-character code from your TV screen",
+      "sendBtn": "Send to TV",
+      "badCode": "Enter a 5-character code (letters and digits)",
+      "sent": "Sent to TV!",
+      "error": "Failed to send to TV",
+      "scanTitle": "Scan QR Code",
+      "scanDescription": "Scan the QR code from your TV screen",
+      "scanBtn": "Scan QR from TV",
+      "stopScan": "Close camera",
+      "noCamera": "Camera access denied",
+      "codeFound": "Code found"
     }
   },
   "balance": {