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/services/creator.go

@@ -8,6 +8,7 @@ import (
 
 	"quyun/v2/app/errorx"
 	creator_dto "quyun/v2/app/http/v1/dto"
+	"quyun/v2/app/requests"
 	"quyun/v2/database/fields"
 	"quyun/v2/database/models"
 	"quyun/v2/pkg/consts"
@@ -109,7 +110,7 @@ func (s *creator) ListContents(
 	ctx context.Context,
 	userID int64,
 	filter *creator_dto.CreatorContentListFilter,
-) ([]creator_dto.CreatorContentItem, error) {
+) (*requests.Pager, error) {
 	tid, err := s.getTenantID(ctx, userID)
 	if err != nil {
 		return nil, err
@@ -143,8 +144,32 @@ func (s *creator) ListContents(
 		q = q.Where(tbl.Title.Like("%" + *filter.Keyword + "%"))
 	}
 
+	// Pagination
+	filter.Pagination.Format()
+	total, err := q.Count()
+	if err != nil {
+		return nil, errorx.ErrDatabaseError.WithCause(err)
+	}
+
 	var list []*models.Content
-	err = q.Order(tbl.ID.Desc()).
+
+	// Sorting
+	sort := "latest"
+	if filter.Sort != nil && *filter.Sort != "" {
+		sort = *filter.Sort
+	}
+	switch sort {
+	case "oldest":
+		q = q.Order(tbl.ID.Asc())
+	case "views":
+		q = q.Order(tbl.Views.Desc())
+	case "likes":
+		q = q.Order(tbl.Likes.Desc())
+	default:
+		q = q.Order(tbl.ID.Desc())
+	}
+
+	err = q.Offset(int(filter.Pagination.Offset())).Limit(int(filter.Pagination.Limit)).
 		UnderlyingDB().
 		Preload("ContentAssets").
 		Preload("ContentAssets.Asset").
@@ -220,9 +245,13 @@ func (s *creator) ListContents(
 			IsPurchased: false,
 		})
 	}
-	return data, nil
-}
 
+	return &requests.Pager{
+		Pagination: filter.Pagination,
+		Total:      total,
+		Items:      data,
+	}, nil
+}
 func (s *creator) CreateContent(ctx context.Context, userID int64, form *creator_dto.ContentCreateForm) error {
 	tid, err := s.getTenantID(ctx, userID)
 	if err != nil {