feat(openflare): Pages 部署包改用 upload 本地文件存储框架

通过 upload.Ingest 摄取 zip 部署包并记录 upload_id，删除部署时调用
upload.Remove；Agent 下载改为 OpenDeploymentPackage 从存储后端流式输出。
新增 of_pages_deployments.upload_id 迁移，保留 artifact_path 兼容旧数据。

Wavelet/internal/model/openflare_pages.go

@@ -47,7 +47,8 @@ type PagesDeployment struct {
 	DeploymentNumber int        `json:"deployment_number" gorm:"not null"`
 	Checksum         string     `json:"checksum" gorm:"size:64;not null;index"`
 	Status           string     `json:"status" gorm:"size:32;not null;default:'uploaded';index"`
-	ArtifactPath     string     `json:"artifact_path" gorm:"size:2048;not null"`
+	UploadID         uint64     `json:"upload_id,string" gorm:"not null;default:0;index"`
+	ArtifactPath     string     `json:"artifact_path,omitempty" gorm:"size:2048;not null;default:''"` // legacy only
 	FileCount        int        `json:"file_count" gorm:"not null;default:0"`
 	TotalSize        int64      `json:"total_size" gorm:"not null;default:0"`
 	CreatedBy        string     `json:"created_by" gorm:"size:64;not null;default:''"`