fix(admin): key tunnels by user_id, server-side initial list load, full-scan user search

app/admin/page.tsx

@@ -6,7 +6,7 @@ import { formatBytes, formatDate } from '@/lib/format';
 export const dynamic = 'force-dynamic';
 
 type OverQuotaRow = {
-  id: string;
+  user_id: string;
   subdomain: string;
   bytes_used: number;
   quota_bytes: number;
@@ -26,7 +26,7 @@ export default async function AdminOverviewPage() {
   // Over-quota tunnels (compute in memory).
   const { data: tunnelsData } = await admin
     .from('tunnels')
-    .select('id, subdomain, bytes_used, quota_bytes');
+    .select('user_id, subdomain, bytes_used, quota_bytes');
   const overQuota = ((tunnelsData ?? []) as OverQuotaRow[])
     .filter((t) => t.quota_bytes > 0 && t.bytes_used >= t.quota_bytes)
     .slice(0, 5);
@@ -100,7 +100,7 @@ export default async function AdminOverviewPage() {
               </thead>
               <tbody>
                 {overQuota.map((t) => (
-                  <tr key={t.id}>
+                  <tr key={t.user_id}>
                     <td>{t.subdomain}</td>
                     <td>
                       {formatBytes(t.bytes_used)} / {formatBytes(t.quota_bytes)}