Add backend-generated sitemap with website manifest sync and nginx SEO proxy support.

Stores synced route config from /meshkee/sitemap-config.json, serves sitemap.xml and robots.txt per tenant, and invalidates cache on CMS writes.

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

src/app.module.ts

@@ -40,6 +40,7 @@ import { InvoicesModule } from './invoices/invoices.module';
 import { LegacyMysqlModule } from './legacy-mysql/legacy-mysql.module';
 import { PublicSmsModule } from './public-sms/public-sms.module';
 import { PaymentsModule } from './payments/payments.module';
+import { SitemapModule } from './sitemap/sitemap.module';
 
 @Module({
   imports: [
@@ -84,6 +85,7 @@ import { PaymentsModule } from './payments/payments.module';
     WebsiteDocsModule,
     InvoicesModule,
     PublicSmsModule,
+    SitemapModule,
   ],
 })
 export class AppModule {}