feat: add multi-channel subscription blocking UI and admin management

- Channel subscription blocking screen with per-channel status display
- Safe URL handling with protocol validation (no open redirect)
- Race-condition-safe subscription check with useRef guard
- Admin channel management page with create, toggle, delete
- Error handlers on all admin mutations with haptic feedback
- Proper type guard for channel subscription error detection
- Accessibility: aria-labels on icon-only buttons
- Localization: en, ru, zh, fa translations

src/locales/en.json

@@ -861,7 +861,8 @@
       "updates": "Updates",
       "pinnedMessages": "Pinned Messages",
       "partners": "Partners",
-      "withdrawals": "Withdrawals"
+      "withdrawals": "Withdrawals",
+      "channelSubscriptions": "Required Channels"
     },
     "panel": {
       "title": "Admin Panel",
@@ -888,7 +889,8 @@
       "updatesDesc": "Bot & cabinet versions",
       "pinnedMessagesDesc": "Manage pinned messages for users",
       "partnersDesc": "Manage partner applications and commissions",
-      "withdrawalsDesc": "Review and process withdrawal requests"
+      "withdrawalsDesc": "Review and process withdrawal requests",
+      "channelSubscriptionsDesc": "Manage required channel subscriptions"
     },
     "trafficUsage": {
       "title": "Traffic Usage",
@@ -1297,6 +1299,28 @@
       "editMessage": "Edit",
       "cantDeleteActive": "Cannot delete active message"
     },
+    "channelSubscriptions": {
+      "title": "Required Channels",
+      "subtitle": "Users must subscribe to these channels",
+      "addChannel": "Add Channel",
+      "empty": "No channels configured",
+      "enabled": "Enabled",
+      "disabled": "Disabled",
+      "enable": "Enable",
+      "disable": "Disable",
+      "delete": "Delete",
+      "deleteConfirm": "Delete this channel?",
+      "sortOrder": "Order",
+      "form": {
+        "title": "Display Name",
+        "channelId": "Channel ID",
+        "channelIdHint": "@username or -100XXXXXXXXXX",
+        "channelLink": "Channel Link",
+        "channelLinkHint": "https://t.me/channel",
+        "submit": "Add",
+        "cancel": "Cancel"
+      }
+    },
     "settings": {
       "title": "System Settings",
       "allCategories": "All categories",
@@ -3144,7 +3168,9 @@
       "waitSeconds": "Wait {{seconds}} sec.",
       "hint": "Click check button after subscribing",
       "notSubscribed": "You haven't subscribed to the channel yet",
-      "checkError": "Check failed. Please try again later."
+      "checkError": "Check failed. Please try again later.",
+      "subscribed": "Subscribed",
+      "channelsRequired": "Subscribe to all channels below to continue"
     },
     "blacklisted": {
       "title": "Access Denied",

src/locales/fa.json

@@ -741,7 +741,8 @@
       "updates": "به‌روزرسانی‌ها",
       "pinnedMessages": "پیام‌های سنجاق‌شده",
       "partners": "شرکا",
-      "withdrawals": "برداشت‌ها"
+      "withdrawals": "برداشت‌ها",
+      "channelSubscriptions": "کانال‌های اجباری"
     },
     "panel": {
       "title": "پنل مدیریت",
@@ -768,7 +769,8 @@
       "updatesDesc": "نسخه‌های ربات و کابینت",
       "pinnedMessagesDesc": "مدیریت پیام‌های سنجاق‌شده",
       "partnersDesc": "مدیریت درخواست‌های شراکت و کمیسیون‌ها",
-      "withdrawalsDesc": "بررسی و پردازش درخواست‌های برداشت"
+      "withdrawalsDesc": "بررسی و پردازش درخواست‌های برداشت",
+      "channelSubscriptionsDesc": "مدیریت اشتراک‌های اجباری کانال"
     },
     "trafficUsage": {
       "title": "مصرف ترافیک",
@@ -1000,6 +1002,28 @@
       "editMessage": "Edit",
       "cantDeleteActive": "Cannot delete active message"
     },
+    "channelSubscriptions": {
+      "title": "کانال‌های اجباری",
+      "subtitle": "کاربران باید در این کانال‌ها عضو شوند",
+      "addChannel": "افزودن کانال",
+      "empty": "کانالی تنظیم نشده",
+      "enabled": "فعال",
+      "disabled": "غیرفعال",
+      "enable": "فعال‌سازی",
+      "disable": "غیرفعال‌سازی",
+      "delete": "حذف",
+      "deleteConfirm": "این کانال حذف شود؟",
+      "sortOrder": "ترتیب",
+      "form": {
+        "title": "نام نمایشی",
+        "channelId": "شناسه کانال",
+        "channelIdHint": "@username یا -100XXXXXXXXXX",
+        "channelLink": "لینک کانال",
+        "channelLinkHint": "https://t.me/channel",
+        "submit": "افزودن",
+        "cancel": "لغو"
+      }
+    },
     "payments": {
       "title": "تأیید پرداخت",
       "description": "پرداخت‌های معلق در ۲۴ ساعت گذشته",
@@ -2759,7 +2783,9 @@
       "waitSeconds": "{{seconds}} ثانیه صبر کنید",
       "hint": "پس از عضویت دکمه بررسی را بزنید",
       "notSubscribed": "شما هنوز در کانال عضو نشده‌اید",
-      "checkError": "بررسی ناموفق بود. لطفاً بعداً دوباره امتحان کنید."
+      "checkError": "بررسی ناموفق بود. لطفاً بعداً دوباره امتحان کنید.",
+      "subscribed": "عضو شده",
+      "channelsRequired": "برای ادامه در همه کانال‌های زیر عضو شوید"
     },
     "blacklisted": {
       "title": "دسترسی ممنوع",

src/locales/ru.json

@@ -883,7 +883,8 @@
       "updates": "Обновления",
       "pinnedMessages": "Закреплённые",
       "partners": "Партнёры",
-      "withdrawals": "Выводы"
+      "withdrawals": "Выводы",
+      "channelSubscriptions": "Обязательные каналы"
     },
     "panel": {
       "title": "Панель администратора",
@@ -910,7 +911,8 @@
       "updatesDesc": "Версии бота и кабинета",
       "pinnedMessagesDesc": "Управление закреплёнными сообщениями",
       "partnersDesc": "Управление заявками партнёров и комиссиями",
-      "withdrawalsDesc": "Проверка и обработка заявок на вывод"
+      "withdrawalsDesc": "Проверка и обработка заявок на вывод",
+      "channelSubscriptionsDesc": "Управление обязательными подписками на каналы"
     },
     "trafficUsage": {
       "title": "Расход трафика",
@@ -1323,6 +1325,28 @@
       "editMessage": "Редактировать",
       "cantDeleteActive": "Нельзя удалить активное сообщение"
     },
+    "channelSubscriptions": {
+      "title": "Обязательные каналы",
+      "subtitle": "Пользователи должны подписаться на эти каналы",
+      "addChannel": "Добавить канал",
+      "empty": "Каналы не настроены",
+      "enabled": "Активен",
+      "disabled": "Отключён",
+      "enable": "Включить",
+      "disable": "Отключить",
+      "delete": "Удалить",
+      "deleteConfirm": "Удалить этот канал?",
+      "sortOrder": "Порядок",
+      "form": {
+        "title": "Название",
+        "channelId": "ID канала",
+        "channelIdHint": "@username или -100XXXXXXXXXX",
+        "channelLink": "Ссылка на канал",
+        "channelLinkHint": "https://t.me/channel",
+        "submit": "Добавить",
+        "cancel": "Отмена"
+      }
+    },
     "settings": {
       "title": "Настройки системы",
       "allCategories": "Все категории",
@@ -3699,7 +3723,9 @@
       "waitSeconds": "Подождите {{seconds}} сек.",
       "hint": "После подписки нажмите кнопку проверки",
       "notSubscribed": "Вы ещё не подписались на канал",
-      "checkError": "Ошибка проверки. Попробуйте позже."
+      "checkError": "Ошибка проверки. Попробуйте позже.",
+      "subscribed": "Подписан",
+      "channelsRequired": "Подпишитесь на все каналы ниже для продолжения"
     },
     "blacklisted": {
       "title": "Доступ запрещён",

src/locales/zh.json

@@ -741,7 +741,8 @@
       "updates": "更新",
       "pinnedMessages": "置顶消息",
       "partners": "合作伙伴",
-      "withdrawals": "提现"
+      "withdrawals": "提现",
+      "channelSubscriptions": "必订频道"
     },
     "panel": {
       "title": "管理面板",
@@ -768,7 +769,8 @@
       "updatesDesc": "机器人和面板版本",
       "pinnedMessagesDesc": "管理用户置顶消息",
       "partnersDesc": "管理合作伙伴申请和佣金",
-      "withdrawalsDesc": "审核和处理提现请求"
+      "withdrawalsDesc": "审核和处理提现请求",
+      "channelSubscriptionsDesc": "管理必订频道订阅"
     },
     "trafficUsage": {
       "title": "流量使用",
@@ -1052,6 +1054,28 @@
       "editMessage": "编辑",
       "cantDeleteActive": "无法删除活跃消息"
     },
+    "channelSubscriptions": {
+      "title": "必订频道",
+      "subtitle": "用户必须订阅这些频道",
+      "addChannel": "添加频道",
+      "empty": "未配置频道",
+      "enabled": "已启用",
+      "disabled": "已禁用",
+      "enable": "启用",
+      "disable": "禁用",
+      "delete": "删除",
+      "deleteConfirm": "删除此频道？",
+      "sortOrder": "排序",
+      "form": {
+        "title": "显示名称",
+        "channelId": "频道ID",
+        "channelIdHint": "@username 或 -100XXXXXXXXXX",
+        "channelLink": "频道链接",
+        "channelLinkHint": "https://t.me/channel",
+        "submit": "添加",
+        "cancel": "取消"
+      }
+    },
     "settings": {
       "title": "系统设置",
       "allCategories": "所有分类",
@@ -2640,7 +2664,9 @@
       "waitSeconds": "请等待 {{seconds}} 秒",
       "hint": "订阅后点击检查按钮",
       "notSubscribed": "您还没有订阅该频道",
-      "checkError": "检查失败。请稍后重试。"
+      "checkError": "检查失败。请稍后重试。",
+      "subscribed": "已订阅",
+      "channelsRequired": "请订阅以下所有频道以继续"
     },
     "blacklisted": {
       "title": "访问被拒绝",