feat: improve squad management UX — rename, swap icons, color gift button

1. Rename "Управление серверами" → "Управление сквадами" across all
   4 locales (ru, en, zh, fa) — title, subtitle, nav, subscription
   options. The page manages RemnaWave squads, not individual servers.

2. Swap toggle button semantics — the button now shows the ACTION
   that will happen on click, not the current state:
   - Active squad: red X icon (click to deactivate)
   - Inactive squad: green checkmark (click to activate)

3. Gift/trial button: amber/orange when functional (clearly clickable),
   gray when disabled. Previously always gray, making it look inactive
   even when it could be clicked.

src/locales/en.json

@@ -555,8 +555,8 @@
       "unlimited": "Unlimited",
       "buyTrafficGb": "Buy {{gb}} GB",
       "buyUnlimited": "Buy Unlimited",
-      "manageServers": "Server management",
-      "manageServersTitle": "Server management"
+      "manageServers": "Squad management",
+      "manageServersTitle": "Squad management"
     },
     "serverManagement": {
       "statusLegend": "✅ — connected • ➕ — will be added (paid) • ➖ — will be disconnected",
@@ -1100,7 +1100,7 @@
       "apps": "Apps",
       "wheel": "Wheel",
       "tariffs": "Tariffs",
-      "servers": "Servers",
+      "servers": "Squads",
       "banSystem": "Ban Monitoring",
       "broadcasts": "Broadcasts",
       "users": "Users",
@@ -2351,8 +2351,8 @@
       }
     },
     "servers": {
-      "title": "Server Management",
-      "subtitle": "Configure VPN servers",
+      "title": "Squad Management",
+      "subtitle": "Configure squads",
       "sync": "Sync",
       "syncing": "Syncing...",
       "syncNow": "Sync now",

src/locales/fa.json

@@ -386,8 +386,8 @@
       "unlimited": "نامحدود",
       "buyTrafficGb": "خرید {{gb}} GB",
       "buyUnlimited": "خرید نامحدود",
-      "manageServers": "مدیریت سرورها",
-      "manageServersTitle": "مدیریت سرورها"
+      "manageServers": "مدیریت اسکوادها",
+      "manageServersTitle": "مدیریت اسکوادها"
     },
     "serverManagement": {
       "statusLegend": "✅ — متصل • ➕ — اضافه خواهد شد (پولی) • ➖ — قطع خواهد شد",
@@ -924,7 +924,7 @@
       "apps": "برنامه‌ها",
       "wheel": "چرخ",
       "tariffs": "تعرفه‌ها",
-      "servers": "سرورها",
+      "servers": "اسکوادها",
       "broadcasts": "پیام‌رسانی",
       "emailTemplates": "قالب‌های ایمیل",
       "paymentMethods": "روش‌های پرداخت",
@@ -1986,8 +1986,8 @@
       }
     },
     "servers": {
-      "title": "مدیریت سرورها",
-      "subtitle": "پیکربندی سرورهای VPN",
+      "title": "مدیریت اسکوادها",
+      "subtitle": "پیکربندی اسکوادها",
       "sync": "همگام‌سازی",
       "syncing": "در حال همگام‌سازی...",
       "syncNow": "همگام‌سازی الان",

src/locales/ru.json

@@ -583,8 +583,8 @@
       "unlimited": "Безлимит",
       "buyTrafficGb": "Купить {{gb}} ГБ",
       "buyUnlimited": "Купить Безлимит",
-      "manageServers": "Управление серверами",
-      "manageServersTitle": "Управление серверами"
+      "manageServers": "Управление сквадами",
+      "manageServersTitle": "Управление сквадами"
     },
     "serverManagement": {
       "statusLegend": "✅ — подключено • ➕ — будет добавлено (платно) • ➖ — будет отключено",
@@ -1121,7 +1121,7 @@
       "apps": "Приложения",
       "wheel": "Колесо",
       "tariffs": "Тарифы",
-      "servers": "Серверы",
+      "servers": "Сквады",
       "banSystem": "Мониторинг банов",
       "broadcasts": "Рассылки",
       "users": "Пользователи",
@@ -2857,8 +2857,8 @@
       }
     },
     "servers": {
-      "title": "Управление серверами",
-      "subtitle": "Настройка серверов VPN",
+      "title": "Управление сквадами",
+      "subtitle": "Настройка сквадов",
       "sync": "Синхронизировать",
       "syncing": "Синхронизация...",
       "syncNow": "Синхронизировать сейчас",

src/locales/zh.json

@@ -386,8 +386,8 @@
       "unlimited": "无限制",
       "buyTrafficGb": "购买 {{gb}} GB",
       "buyUnlimited": "购买无限流量",
-      "manageServers": "服务器管理",
-      "manageServersTitle": "服务器管理"
+      "manageServers": "小队管理",
+      "manageServersTitle": "小队管理"
     },
     "serverManagement": {
       "statusLegend": "✅ — 已连接 • ➕ — 将添加（付费）• ➖ — 将断开",
@@ -924,7 +924,7 @@
       "apps": "应用",
       "wheel": "转盘",
       "tariffs": "套餐",
-      "servers": "服务器",
+      "servers": "小队",
       "broadcasts": "群发",
       "emailTemplates": "邮件模板",
       "paymentMethods": "支付方式",

src/pages/AdminServers.tsx

@@ -186,14 +186,14 @@ export default function AdminServers() {
                     onClick={() => toggleMutation.mutate(server.id)}
                     className={`rounded-lg p-2 transition-colors ${
                       server.is_available
-                        ? 'bg-success-500/20 text-success-400 hover:bg-success-500/30'
-                        : 'bg-dark-700 text-dark-400 hover:bg-dark-600'
+                        ? 'bg-error-500/20 text-error-400 hover:bg-error-500/30'
+                        : 'bg-success-500/20 text-success-400 hover:bg-success-500/30'
                     }`}
                     title={
                       server.is_available ? t('admin.servers.disable') : t('admin.servers.enable')
                     }
                   >
-                    {server.is_available ? <CheckIcon /> : <XIcon />}
+                    {server.is_available ? <XIcon /> : <CheckIcon />}
                   </button>
 
                   {/* Toggle Trial */}
@@ -201,7 +201,7 @@ export default function AdminServers() {
                     onClick={() => toggleTrialMutation.mutate(server.id)}
                     className={`rounded-lg p-2 transition-colors ${
                       server.is_trial_eligible
-                        ? 'bg-accent-500/20 text-accent-400 hover:bg-accent-500/30'
+                        ? 'bg-warning-500/20 text-warning-400 hover:bg-warning-500/30'
                         : 'bg-dark-700 text-dark-400 hover:bg-dark-600'
                     }`}
                     title={t('admin.servers.toggleTrial')}