feat(auth): add module read/write admin RBAC

Introduce permission catalog, PermissionsGuard, JWT/me payload with
role+permissions, and gate all module controllers. Admins CRUD accepts
role/permissions with safety rules; migrate existing users to super_admin.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/servers/servers.module.ts

@@ -1,10 +1,11 @@
 import { Module } from '@nestjs/common';
+import { AuthModule } from '../auth/auth.module';
 import { NotificationsModule } from '../notifications/notifications.module';
 import { ServersController } from './servers.controller';
 import { ServersService } from './servers.service';
 
 @Module({
-  imports: [NotificationsModule],
+  imports: [NotificationsModule, AuthModule],
   controllers: [ServersController],
   providers: [ServersService],
   exports: [ServersService],