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>

src/components/admin/NodesTable.tsx

@@ -107,6 +107,20 @@ export function NodesTable({ nodes }: { nodes: V2Node[] }) {
                   >
                     {t("actionDrain")}
                   </button>
+                  <button
+                    onClick={() => action(node.id, "restart")}
+                    disabled={loading[node.id]}
+                    className="rounded px-2.5 py-1 text-xs text-blue-300 border border-blue-500/30 hover:bg-blue-500/10 disabled:opacity-40 disabled:cursor-not-allowed transition-colors"
+                  >
+                    {t("actionRestart")}
+                  </button>
+                  <button
+                    onClick={() => action(node.id, "close-ae")}
+                    disabled={loading[node.id]}
+                    className="rounded px-2.5 py-1 text-xs text-orange-300 border border-orange-500/30 hover:bg-orange-500/10 disabled:opacity-40 disabled:cursor-not-allowed transition-colors"
+                  >
+                    {t("actionCloseAe")}
+                  </button>
                   <button
                     onClick={() => action(node.id, "release")}
                     disabled={loading[node.id]}