feat: 添加内容排序功能，优化内容列表查询和加载状态处理

backend/app/http/v1/dto/creator.go

@@ -93,8 +93,9 @@ type CreatorContentListFilter struct {
 	Status     *string `query:"status"`
 	Visibility *string `query:"visibility"`
 	Genre      *string `query:"genre"`
-	Key     *string `query:"key"`
-	Keyword *string `query:"keyword"`
+	Key        *string `query:"key"`
+	Keyword    *string `query:"keyword"`
+	Sort       *string `query:"sort"`
 }
 
 type CreatorOrderListFilter struct {