feat: add update availability filter to model list

Add a new filter option to show only models with available updates across all supported languages. This includes:

- Adding "updates" filter translations in all locale files (de, en, es, fr, he, ja, ko)
- Extending BaseModelApiClient to handle update_available_only query parameter
- Implementing update filter button in PageControls component with event listeners
- Adding corresponding CSS styles for active filter state

The feature allows users to quickly identify and focus on models that have updates available, improving the update management workflow.

locales/ko.json

@@ -431,6 +431,10 @@
             "favorites": {
                 "title": "즐겨찾기만 보기",
                 "action": "즐겨찾기"
+            },
+            "updates": {
+                "title": "업데이트 가능한 모델만 표시",
+                "action": "업데이트"
             }
         },
         "bulkOperations": {