Add video download failure reporting feature

- Introduced a new API endpoint `POST /api/v1/video/remove_watermark/report_failure` for reporting download failures.
- Added a new database table `video_download_failures` to store details about failed downloads, including domain, URL, error message, and reporting metadata.
- Updated the video handler to process failure reports and save them to the database.
- Enhanced documentation to include details about the new reporting feature and its usage.

internal/routes/remove_watermark_routes.go

@@ -6,8 +6,10 @@ import (
 	rmhandler "wx_service/internal/remove_watermark/handler"
 )
 
-func registerRemoveWatermarkRoutes(protected *gin.RouterGroup, videoHandler *rmhandler.VideoHandler) {
-	// 去水印相关接口（保持原有路径不变）
+func registerRemoveWatermarkRoutes(api *gin.RouterGroup, protected *gin.RouterGroup, videoHandler *rmhandler.VideoHandler) {
+	// 去水印解析与广告解锁：需要登录鉴权
 	protected.POST("/video/remove_watermark", videoHandler.RemoveWatermark)
 	protected.POST("/video/remove_watermark/unlock", videoHandler.UnlockQuota)
+	// 下载失败上报：供其他服务调用，无需鉴权
+	api.POST("/video/remove_watermark/report_failure", videoHandler.ReportDownloadFailure)
 }