feat(admin): super-admin user detail dashboard

Add a read-only User Detail dashboard for super admins, reachable by
clicking a user name in the admin users list.

Backend: new `admin` module aggregating existing domain services
(no new entities). ADMIN-only endpoints under /api/v1/admin:
overview (profile, account status, wallet balance, revenue, summary
counts), wallet transactions, applications (incl. deleted/docked with
restore eligibility), build/deploy errors, tickets with conversation,
and a composite activity timeline. Adds BillingService.getRevenueSummary
and guards against a wallet get-or-create race in the overview reads.

Frontend: tabbed detail page (overview/applications/activity/errors/
tickets) with lazy per-tab queries; user names in the admin list link to
it (admin only); fa/en i18n keys and response types.

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

backend/src/admin/admin.module.ts

@@ -0,0 +1,26 @@
+import { Module } from '@nestjs/common';
+import { AdminUsersController } from './admin-users.controller';
+import { AdminUsersService } from './admin-users.service';
+import { UsersModule } from '../users/users.module';
+import { BillingModule } from '../billing/billing.module';
+import { ApplicationsModule } from '../applications/applications.module';
+import { DeploymentsModule } from '../deployments/deployments.module';
+import { TicketsModule } from '../tickets/tickets.module';
+
+/**
+ * Super-admin aggregation module. Imports the domain modules (which export
+ * their services) so the admin controller can read everything about a user
+ * without re-implementing per-module logic.
+ */
+@Module({
+  imports: [
+    UsersModule,
+    BillingModule,
+    ApplicationsModule,
+    DeploymentsModule,
+    TicketsModule,
+  ],
+  controllers: [AdminUsersController],
+  providers: [AdminUsersService],
+})
+export class AdminModule {}