feat: sync initial schema migration

backend/database/models/media_assets.query.gen.go

@@ -64,7 +64,7 @@ type mediaAssetQuery struct {
 	CreatedAt     field.Time
 	UpdatedAt     field.Time
 	DeletedAt     field.Field
-	Hash          field.String // File SHA-256 hash
+	Hash          field.String // 文件 MD5 哈希
 
 	fieldMap map[string]field.Expr
 }