新增: SFTP直连+网站预览+OSS区域嗅探+热键+BGM播放

internal/storage/models/download_cache.go

@@ -0,0 +1,17 @@
+package models
+
+import "time"
+
+// DownloadCache 下载缓存模型（SQLite 持久化）
+type DownloadCache struct {
+	ID           uint      `gorm:"primaryKey"`
+	Transport    string    `gorm:"not null;size:10;index:idx_cache_lookup"`
+	ConnID       string    `gorm:"not null;index:idx_cache_lookup"`
+	RemotePath   string    `gorm:"not null;index:idx_cache_lookup"`
+	FileSize     int64     `gorm:"not null;index:idx_cache_lookup"`
+	ModTime      string    `gorm:"not null;index:idx_cache_lookup"`
+	LocalPath    string    `gorm:"not null"`
+	DownloadedAt time.Time `gorm:"not null"`
+}
+
+func (DownloadCache) TableName() string { return "download_cache" }