feat: Add new model management features

- Implement `/api/channel/models_enabled` endpoint to retrieve enabled models
- Add `EnabledListModels` handler in controller
- Create new `ModelRatioNotSetEditor` component for managing unset model ratios
- Update router to include new models_enabled route
- Add internationalization support for new model management UI
- Include GPT-4.5 preview model in OpenAI model list

router/api-router.go

@@ -84,6 +84,7 @@ func SetApiRouter(router *gin.Engine) {
 			channelRoute.GET("/", controller.GetAllChannels)
 			channelRoute.GET("/search", controller.SearchChannels)
 			channelRoute.GET("/models", controller.ChannelListModels)
+			channelRoute.GET("/models_enabled", controller.EnabledListModels)
 			channelRoute.GET("/:id", controller.GetChannel)
 			channelRoute.GET("/test", controller.TestAllChannels)
 			channelRoute.GET("/test/:id", controller.TestChannel)