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/en.json

@@ -3075,6 +3075,19 @@
         "language": "Language",
         "registration": "Registration",
         "lastActivity": "Last activity",
+        "botActivity": "Bot activity",
+        "cabinetLastLogin": "Last cabinet login",
+        "vpnConnection": "VPN connection",
+        "lastConnection": "Last connection",
+        "firstConnection": "First connection",
+        "online": "Online",
+        "requestHistory": "Subscription request history",
+        "requestHistoryTotal": "Total requests",
+        "requestAt": "Date",
+        "requestIp": "IP address",
+        "requestUserAgent": "Device",
+        "loadMore": "Show more",
+        "noRequests": "No requests",
         "totalSpent": "Total spent",
         "purchases": "Purchases",
         "campaign": "Advertising campaign",