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/creator.go

@@ -2,6 +2,7 @@ package v1
 
 import (
 	"quyun/v2/app/http/v1/dto"
+	"quyun/v2/app/requests"
 	"quyun/v2/app/services"
 	"quyun/v2/database/models"
 
@@ -75,7 +76,7 @@ func (c *Creator) ListContents(
 	ctx fiber.Ctx,
 	user *models.User,
 	filter *dto.CreatorContentListFilter,
-) ([]dto.CreatorContentItem, error) {
+) (*requests.Pager, error) {
 	return services.Creator.ListContents(ctx, user.ID, filter)
 }