feat(admin): plan statistics + node restart/close-ae actions

Final legacy-admin items:
- identity GET /v1/admin/plan-statistics (active/total users + revenue per plan
  from user_plans); surfaced as a breakdown table in /admin/stats
- NodesTable: wire Restart + Close-AE actions (backend already supported them) via
  new proxy routes; was only drain/release before

Full DivineGateWeb legacy-admin parity achieved.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

messages/en.json

@@ -398,7 +398,9 @@
       "colTags": "Tags",
       "colActions": "Actions",
       "actionDrain": "Drain",
-      "actionRelease": "Release"
+      "actionRelease": "Release",
+      "actionRestart": "Restart",
+      "actionCloseAe": "Close AE"
     },
     "componentsAdminRenderQueueTable": {
       "emptyState": "No render jobs found for the selected filter.",

messages/fa.json

@@ -398,7 +398,9 @@
       "colTags": "برچسب‌ها",
       "colActions": "عملیات",
       "actionDrain": "تخلیه",
-      "actionRelease": "آزادسازی"
+      "actionRelease": "آزادسازی",
+      "actionRestart": "ری‌استارت",
+      "actionCloseAe": "بستن AE"
     },
     "componentsAdminRenderQueueTable": {
       "emptyState": "هیچ کار رندری برای فیلتر انتخاب‌شده یافت نشد.",