fix: use admin R2 avatars for operator activity..

src/admins/admin-avatar.ts

@@ -0,0 +1,9 @@
+import { ConfigService } from '@nestjs/config';
+
+export function getAdminAvatarUrl(adminId: string | null | undefined, configService: ConfigService) {
+  const publicBaseUrl = configService.get<string>('R2_PUBLIC_BASE_URL')?.replace(/\/+$/, '');
+  if (!adminId || !publicBaseUrl) return null;
+
+  const prefix = configService.get<string>('R2_PUBLIC_FILE_PREFIX', 'studio-files/public');
+  return `${publicBaseUrl}/${prefix.replace(/^\/+|\/+$/g, '')}/admins/${adminId}/avatar`;
+}