fix(registry): align OCI and RubyGems API behavior and improve npm search result ordering

ts/rubygems/helpers.rubygems.ts

@@ -254,14 +254,12 @@ export function generateVersionsJson(
     uploadTime?: string;
   }>
 ): any {
-  return {
-    name: gemName,
-    versions: versions.map(v => ({
-      number: v.version,
-      platform: v.platform || 'ruby',
-      built_at: v.uploadTime,
-    })),
-  };
+  // RubyGems.org API returns a flat array at /api/v1/versions/{gem}.json
+  return versions.map(v => ({
+    number: v.version,
+    platform: v.platform || 'ruby',
+    built_at: v.uploadTime,
+  }));
 }
 
 /**