feat: show VPN connection info and subscription request history on admin user detail

- Load panelInfo eagerly on page load (not just on subscription tab)
- Add VPN connection card to info tab: last/first connection, online status indicator, last node
- Rename "Last activity" to "Bot activity" to distinguish from VPN connection
- Show cabinet_last_login field that was never rendered
- Add collapsible subscription request history section in subscription tab with paginated table
- Add subscription request history API types and method
- Add i18n keys for all 4 locales (ru, en, zh, fa)

src/locales/zh.json

@@ -2578,6 +2578,19 @@
         "language": "语言",
         "registration": "注册时间",
         "lastActivity": "最后活跃",
+        "botActivity": "机器人活动",
+        "cabinetLastLogin": "最后登录面板",
+        "vpnConnection": "VPN 连接",
+        "lastConnection": "最后连接",
+        "firstConnection": "首次连接",
+        "online": "在线",
+        "requestHistory": "订阅请求历史",
+        "requestHistoryTotal": "总请求数",
+        "requestAt": "日期",
+        "requestIp": "IP 地址",
+        "requestUserAgent": "设备",
+        "loadMore": "显示更多",
+        "noRequests": "没有请求",
         "totalSpent": "总消费",
         "purchases": "购买次数",
         "campaign": "广告活动",