feat: add tickets tab to admin user detail page

Add ability to view user's tickets directly from the user detail page.
Backend gets user_id filter on tickets endpoint, frontend shows ticket
list with status badges, message preview and navigation to ticket.

src/locales/en.json

@@ -1839,8 +1839,12 @@
           "info": "Information",
           "subscription": "Subscription",
           "balance": "Balance",
-          "sync": "Synchronization"
+          "sync": "Synchronization",
+          "tickets": "Tickets"
         },
+        "noTickets": "No tickets from this user",
+        "ticketsCount": "tickets",
+        "messagesCount": "messages",
         "status": "Status",
         "language": "Language",
         "registration": "Registration",

src/locales/fa.json

@@ -1542,8 +1542,12 @@
           "info": "اطلاعات",
           "subscription": "اشتراک",
           "balance": "موجودی",
-          "sync": "همگام‌سازی"
+          "sync": "همگام‌سازی",
+          "tickets": "تیکت‌ها"
         },
+        "noTickets": "این کاربر تیکتی ندارد",
+        "ticketsCount": "تیکت",
+        "messagesCount": "پیام",
         "status": "وضعیت",
         "language": "زبان",
         "registration": "ثبت‌نام",

src/locales/ru.json

@@ -2366,8 +2366,12 @@
           "info": "Информация",
           "subscription": "Подписка",
           "balance": "Баланс",
-          "sync": "Синхронизация"
+          "sync": "Синхронизация",
+          "tickets": "Тикеты"
         },
+        "noTickets": "У пользователя нет тикетов",
+        "ticketsCount": "тикетов",
+        "messagesCount": "сообщений",
         "status": "Статус",
         "language": "Язык",
         "registration": "Регистрация",

src/locales/zh.json

@@ -1541,8 +1541,12 @@
           "info": "信息",
           "subscription": "订阅",
           "balance": "余额",
-          "sync": "同步"
+          "sync": "同步",
+          "tickets": "工单"
         },
+        "noTickets": "该用户没有工单",
+        "ticketsCount": "个工单",
+        "messagesCount": "条消息",
         "status": "状态",
         "language": "语言",
         "registration": "注册时间",