feat: add blacklisted user blocking screen

Add BlacklistedScreen component, blocking store type, API error interceptor,
and i18n translations (ru, en, zh, fa) for blacklisted users.

src/locales/en.json

@@ -2627,6 +2627,12 @@
       "hint": "Click check button after subscribing",
       "notSubscribed": "You haven't subscribed to the channel yet",
       "checkError": "Check failed. Please try again later."
+    },
+    "blacklisted": {
+      "title": "Access Denied",
+      "defaultMessage": "Your account has been blocked.",
+      "reason": "Reason",
+      "contactSupport": "If you believe this is an error, please contact support."
     }
   }
 }

src/locales/fa.json

@@ -2271,6 +2271,12 @@
       "hint": "پس از عضویت دکمه بررسی را بزنید",
       "notSubscribed": "شما هنوز در کانال عضو نشده‌اید",
       "checkError": "بررسی ناموفق بود. لطفاً بعداً دوباره امتحان کنید."
+    },
+    "blacklisted": {
+      "title": "دسترسی ممنوع",
+      "defaultMessage": "حساب شما مسدود شده است.",
+      "reason": "دلیل",
+      "contactSupport": "اگر فکر می‌کنید این اشتباه است، با پشتیبانی تماس بگیرید."
     }
   }
 }

src/locales/ru.json

@@ -3340,6 +3340,12 @@
       "hint": "После подписки нажмите кнопку проверки",
       "notSubscribed": "Вы ещё не подписались на канал",
       "checkError": "Ошибка проверки. Попробуйте позже."
+    },
+    "blacklisted": {
+      "title": "Доступ запрещён",
+      "defaultMessage": "Ваш аккаунт заблокирован.",
+      "reason": "Причина",
+      "contactSupport": "Если вы считаете, что это ошибка, обратитесь в поддержку."
     }
   }
 }

src/locales/zh.json

@@ -2152,6 +2152,12 @@
       "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。"
+    },
+    "blacklisted": {
+      "title": "访问被拒绝",
+      "defaultMessage": "您的帐户已被封锁。",
+      "reason": "原因",
+      "contactSupport": "如果您认为这是错误，请联系客服。"
     }
   },
   "banSystem": {