feat: 添加内容置顶功能，更新相关数据模型和前端视图

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

@@ -41,6 +41,7 @@ type ContentUpdateForm struct {
 	Key      string   `json:"key"`
 	Price    *float64 `json:"price"`
 	Status   string   `json:"status"`
+	IsPinned *bool    `json:"is_pinned"`
 	CoverIDs []string `json:"cover_ids"`
 	MediaIDs []string `json:"media_ids"`
 }
@@ -71,6 +72,7 @@ type CreatorContentItem struct {
 	VideoCount  int     `json:"video_count"`
 	AudioCount  int     `json:"audio_count"`
 	Status      string  `json:"status"`
+	IsPinned    bool    `json:"is_pinned"`
 	IsPurchased bool    `json:"is_purchased"`
 }
 

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

@@ -9,9 +9,9 @@ type UploadInitForm struct {
 }
 
 type UploadInitResponse struct {
-	UploadID string `json:"upload_id"`
-	Key      string `json:"key"` // For S3 direct
-	ChunkSize int64 `json:"chunk_size"`
+	UploadID  string `json:"upload_id"`
+	Key       string `json:"key"` // For S3 direct
+	ChunkSize int64  `json:"chunk_size"`
 }
 
 type UploadPartForm struct {