fix file size limit

apps/api-gateway/src/controllers/app-release.controller.ts

@@ -140,7 +140,9 @@ export class AppReleaseController {
     response.setHeader('Content-Length', resolved.fileSize);
     response.setHeader('X-Release-Version', resolved.version);
     response.setHeader('X-Release-Version-Code', String(resolved.versionCode));
-    response.setHeader('X-Release-Variant', resolved.variant);
+    if (resolved.variant) {
+      response.setHeader('X-Release-Variant', resolved.variant);
+    }
     response.setHeader('X-Release-Sha256', resolved.sha256);
     response.setHeader('Cache-Control', 'public, max-age=300');
     response.setHeader('Content-Disposition', buildContentDisposition('attachment', resolved.fileName));

apps/sso-core/src/domain/app-release.service.ts

@@ -343,7 +343,7 @@ export class AppReleaseService {
       sha256: release.sha256,
       version: release.version,
       versionCode: release.versionCode,
-      variant: release.variant
+      variant: release.variant || 'universal'
     };
   }
 }