refactor(asset): remove legacy GCS repository implementation

- Deleted the old GCS repository code to streamline asset management.
- Updated the new repository implementation to align with the latest domain structure.
- Ensured compatibility with the new repository interface for improved modularity and maintainability.

asset/domain/repository/repository.go

@@ -0,0 +1,31 @@
+package repository
+
+import (
+	"context"
+	"io"
+
+	"github.com/reearth/reearthx/asset/domain"
+)
+
+type Reader interface {
+	Read(ctx context.Context, id domain.ID) (*domain.Asset, error)
+	List(ctx context.Context) ([]*domain.Asset, error)
+}
+
+type Writer interface {
+	Create(ctx context.Context, asset *domain.Asset) error
+	Update(ctx context.Context, asset *domain.Asset) error
+	Delete(ctx context.Context, id domain.ID) error
+}
+
+type FileOperator interface {
+	Upload(ctx context.Context, id domain.ID, content io.Reader) error
+	Download(ctx context.Context, id domain.ID) (io.ReadCloser, error)
+	GetUploadURL(ctx context.Context, id domain.ID) (string, error)
+}
+
+type Repository interface {
+	Reader
+	Writer
+	FileOperator
+}

asset/infrastructure/gcs/repository.go

@@ -9,6 +9,7 @@ import (
 
 	"cloud.google.com/go/storage"
 	"github.com/reearth/reearthx/asset/domain"
+	"github.com/reearth/reearthx/asset/domain/repository"
 	"google.golang.org/api/iterator"
 )
 
@@ -18,7 +19,7 @@ type Repository struct {
 	basePath   string
 }
 
-var _ domain.Repository = (*Repository)(nil)
+var _ repository.Repository = (*Repository)(nil)
 
 func NewRepository(ctx context.Context, bucketName string) (*Repository, error) {
 	client, err := storage.NewClient(ctx)