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

readme.md

@@ -41,7 +41,7 @@ For reporting bugs, issues, or security vulnerabilities, please visit [community
 | Metadata API | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | Token Auth | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | Checksum Verification | ✅ | ✅ | ✅ | ✅ | — | ✅ | ✅ |
-| Upstream Proxy | ✅ | ✅ | — | — | — | — | — |
+| Upstream Proxy | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
 
 ### 🌐 Upstream Proxy & Caching
 - **Multi-Upstream Support**: Configure multiple upstream registries per protocol with priority ordering