feat(api): public album info with locale fallback

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

services/api/src/app-cn.module.ts

@@ -20,6 +20,7 @@ import { AllExceptionsFilter } from './all-exceptions.filter';
 import { AuthModule } from './auth/auth.module';
 import { HealthController } from './health.controller';
 import { PrismaModule } from './prisma/prisma.module';
+import { PublicModule } from './public/public.module';
 import { RequestIdMiddleware, resolveRequestId } from './request-id.middleware';
 import { UploadsModule } from './uploads/uploads.module';
 import { resolveLogLevel } from './shared/log-level';
@@ -34,6 +35,8 @@ import type { ServerRequestWithId } from './shared/request-with-id';
     AlbumsModule,
     // 上传域（Task 18 init；Task 19 renew/complete/history）。
     UploadsModule,
+    // 公开（观众端）域（Task 22 getPublicAlbum；Task 23 公开照片读）。
+    PublicModule,
     LoggerModule.forRoot({
       pinoHttp: {
         // 与 RequestIdMiddleware 共用同一解析函数：优先透传 x-request-id，