feat: 实现视频分片上传与断点续传

- 后端：init/upload/status/complete 四个分片上传接口
- 后端：基于 Redis 的上传会话管理，支持断点续传
- 后端：分片 MD5 校验、幂等上传、顺序合并
- 测试：覆盖完整上传流程、断点续传、幂等性、哈希校验、未完成合并、状态查询
- 前端：Vue 3 分片上传组件，支持并发上传与进度展示

backend/internal/http/router.go

@@ -62,6 +62,7 @@ func SetRouter(db *gorm.DB, cache *rediscache.Client, rmq *rabbitmq.RabbitMQ) *g
 	}
 	videoService := video.NewVideoService(videoRepository, cache, popularityMQ)
 	videoHandler := video.NewVideoHandler(videoService, accountService)
+	chunkHandler := video.NewChunkUploadHandler(cache)
 	videoGroup := r.Group("/video")
 	{
 		videoGroup.POST("/listByAuthorID", videoHandler.ListByAuthorID)
@@ -73,6 +74,10 @@ func SetRouter(db *gorm.DB, cache *rediscache.Client, rmq *rabbitmq.RabbitMQ) *g
 		protectedVideoGroup.POST("/uploadVideo", videoHandler.UploadVideo)
 		protectedVideoGroup.POST("/uploadCover", videoHandler.UploadCover)
 		protectedVideoGroup.POST("/publish", videoHandler.PublishVideo)
+		protectedVideoGroup.POST("/chunk/init", chunkHandler.InitChunkUpload)
+		protectedVideoGroup.POST("/chunk/upload", chunkHandler.UploadChunk)
+		protectedVideoGroup.POST("/chunk/status", chunkHandler.ChunkStatus)
+		protectedVideoGroup.POST("/chunk/complete", chunkHandler.CompleteChunkUpload)
 	}
 	// like
 	likeMQ, err := rabbitmq.NewLikeMQ(rmq)