feat: 添加内容可见性字段和过滤选项，优化内容列表查询功能

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

@@ -72,6 +72,7 @@ type CreatorContentItem struct {
 	VideoCount  int     `json:"video_count"`
 	AudioCount  int     `json:"audio_count"`
 	Status      string  `json:"status"`
+	Visibility  string  `json:"visibility"`
 	CreatedAt   string  `json:"created_at"`
 	IsPinned    bool    `json:"is_pinned"`
 	IsPurchased bool    `json:"is_purchased"`
@@ -89,8 +90,9 @@ type AssetDTO struct {
 
 type CreatorContentListFilter struct {
 	requests.Pagination
-	Status  *string `query:"status"`
-	Genre   *string `query:"genre"`
+	Status     *string `query:"status"`
+	Visibility *string `query:"visibility"`
+	Genre      *string `query:"genre"`
 	Key     *string `query:"key"`
 	Keyword *string `query:"keyword"`
 }