fix: Resolver conflicto de export ApiKey en auth module

El interface ApiKey de apiKeys.service.ts conflictuaba con la entity
ApiKey de entities/. Se usan exports explícitos para evitar la colisión.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/modules/auth/index.ts

@@ -2,8 +2,15 @@ export * from './auth.service.js';
 export * from './auth.controller.js';
 export { default as authRoutes } from './auth.routes.js';
 
-// API Keys
+// API Keys - explicit exports to avoid conflict with ApiKey entity
-export * from './apiKeys.service.js';
+export {
+  apiKeysService,
+  CreateApiKeyDto,
+  UpdateApiKeyDto,
+  ApiKeyWithPlainKey,
+  ApiKeyValidationResult,
+  ApiKeyFilters
+} from './apiKeys.service.js';
 export * from './apiKeys.controller.js';
 export { default as apiKeysRoutes } from './apiKeys.routes.js';