test(05-04): add failing tests for attach File, Thumb, and bucket

- ThumbFilename/PartitionDirectory/File.Thumb behavior tests
- OpenBucket fail-loud and memblob tests
- Migrate empty plugin list must create system_files

lagoon/attach/file.go

@@ -0,0 +1,48 @@
+package attach
+
+import "time"
+
+// Owner is implemented by models that own system_files rows. MorphName
+// must return the PHP class string so cutover-copied attachment_type
+// values keep matching.
+type Owner interface {
+	MorphName() string
+}
+
+// File is Winter's system_files row. AttachmentID is a string because
+// Winter stores the morph FK as a string, never an integer.
+type File struct {
+	ID             uint      `gorm:"column:id;primaryKey"`
+	DiskName       string    `gorm:"column:disk_name"`
+	FileName       string    `gorm:"column:file_name"`
+	FileSize       int64     `gorm:"column:file_size"`
+	ContentType    string    `gorm:"column:content_type"`
+	Title          *string   `gorm:"column:title"`
+	Description    *string   `gorm:"column:description"`
+	Field          string    `gorm:"column:field"`
+	AttachmentID   string    `gorm:"column:attachment_id"`
+	AttachmentType string    `gorm:"column:attachment_type"`
+	IsPublic       bool      `gorm:"column:is_public"`
+	SortOrder      int       `gorm:"column:sort_order"`
+	Metadata       *string   `gorm:"column:metadata"`
+	CreatedAt      time.Time `gorm:"column:created_at"`
+	UpdatedAt      time.Time `gorm:"column:updated_at"`
+}
+
+func (File) TableName() string { return "system_files" }
+
+var all []any
+
+// Register appends models so schema tooling can see File without a plugin registry.
+func Register(models ...any) {
+	all = append(all, models...)
+}
+
+// All returns every model registered in this package.
+func All() []any {
+	return all
+}
+
+func init() {
+	Register(&File{})
+}