支持动态更新管理员密码和下载次数逻辑完善，优化相关错误处理和配置更新流程

internal/api/admin/batch.go

@@ -29,11 +29,12 @@ type ListBatchesResponse struct {
 }
 
 type UpdateBatchRequest struct {
-	Remark       string     `json:"remark"`
-	ExpireType   string     `json:"expire_type"`
-	ExpireAt     *time.Time `json:"expire_at"`
-	MaxDownloads int        `json:"max_downloads"`
-	Status       string     `json:"status"`
+	Remark        *string    `json:"remark"`
+	ExpireType    *string    `json:"expire_type"`
+	ExpireAt      *time.Time `json:"expire_at"`
+	MaxDownloads  *int       `json:"max_downloads"`
+	DownloadCount *int       `json:"download_count"`
+	Status        *string    `json:"status"`
 }
 
 // ListBatches 获取批次列表
@@ -136,15 +137,32 @@ func (h *BatchHandler) UpdateBatch(c *gin.Context) {
 	}
 
 	updates := make(map[string]interface{})
-	updates["remark"] = input.Remark
-	updates["expire_type"] = input.ExpireType
-	updates["expire_at"] = input.ExpireAt
-	updates["max_downloads"] = input.MaxDownloads
-	updates["status"] = input.Status
+	if input.Remark != nil {
+		updates["remark"] = *input.Remark
+	}
+	if input.ExpireType != nil {
+		updates["expire_type"] = *input.ExpireType
+	}
+	if input.ExpireAt != nil {
+		updates["expire_at"] = input.ExpireAt
+	}
+	if input.MaxDownloads != nil {
+		updates["max_downloads"] = *input.MaxDownloads
+	}
+	if input.DownloadCount != nil {
+		updates["download_count"] = *input.DownloadCount
+	}
+	if input.Status != nil {
+		updates["status"] = *input.Status
+	}
 
-	if err := bootstrap.DB.Model(&batch).Updates(updates).Error; err != nil {
-		c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, err.Error()))
-		return
+	if len(updates) > 0 {
+		if err := bootstrap.DB.Model(&batch).Updates(updates).Error; err != nil {
+			c.JSON(http.StatusInternalServerError, model.ErrorResponse(model.CodeInternalError, err.Error()))
+			return
+		}
+		// 重新从数据库读取，确保返回的是完整且最新的数据
+		bootstrap.DB.First(&batch, "id = ?", id)
 	}
 
 	c.JSON(http.StatusOK, model.SuccessResponse(batch))