feat: add system info card to admin dashboard

Shows cabinet version, bot version, Python version, uptime, users and
active subscriptions at the bottom of the dashboard page.

src/locales/en.json

@@ -2205,6 +2205,15 @@
       "purchasedWeek": "Week",
       "purchasedMonth": "Month",
       "noTariffs": "No tariffs"
+    },
+    "systemInfo": {
+      "title": "System",
+      "cabinet": "Cabinet",
+      "bot": "Bot",
+      "python": "Python",
+      "uptime": "Uptime",
+      "users": "Users",
+      "activeSubs": "Active Subs"
     }
   },
   "banSystem": {

src/locales/fa.json

@@ -2008,6 +2008,15 @@
       "amount": "مبلغ",
       "method": "روش",
       "date": "تاریخ"
+    },
+    "systemInfo": {
+      "title": "سیستم",
+      "cabinet": "کابینت",
+      "bot": "ربات",
+      "python": "Python",
+      "uptime": "آپتایم",
+      "users": "کاربران",
+      "activeSubs": "اشتراک‌ها"
     }
   },
   "profile": {

src/locales/ru.json

@@ -2756,6 +2756,15 @@
       "amount": "Сумма",
       "method": "Метод",
       "date": "Дата"
+    },
+    "systemInfo": {
+      "title": "Система",
+      "cabinet": "Кабинет",
+      "bot": "Бот",
+      "python": "Python",
+      "uptime": "Аптайм",
+      "users": "Юзеров",
+      "activeSubs": "Подписок"
     }
   },
   "banSystem": {

src/locales/zh.json

@@ -2007,6 +2007,15 @@
       "amount": "金额",
       "method": "方法",
       "date": "日期"
+    },
+    "systemInfo": {
+      "title": "系统",
+      "cabinet": "面板",
+      "bot": "机器人",
+      "python": "Python",
+      "uptime": "运行时间",
+      "users": "用户",
+      "activeSubs": "订阅"
     }
   },
   "profile": {