feat: add image management functionality

- Implemented image folder repository with CRUD operations.
- Added image reference repository for managing image references to articles.
- Created image repository for handling image assets, including listing, inserting, updating, and deleting images.
- Introduced image usage repository to track storage usage and quotas for tenants.
- Added SQL queries for image assets, folders, references, and usage.
- Developed image handler for HTTP endpoints to manage images and folders.
- Created database migration scripts for image-related tables and structures.

server/internal/shared/objectstorage/client.go

@@ -17,6 +17,7 @@ type Client interface {
 	Validate() error
 	PutBytes(ctx context.Context, objectKey string, content []byte, contentType string) error
 	GetBytes(ctx context.Context, objectKey string) ([]byte, error)
+	Exists(ctx context.Context, objectKey string) (bool, error)
 	Delete(ctx context.Context, objectKey string) error
 	PublicURL(objectKey string) (string, error)
 }
@@ -54,6 +55,10 @@ func (c disabledClient) GetBytes(context.Context, string) ([]byte, error) {
 	return nil, c.Validate()
 }
 
+func (c disabledClient) Exists(context.Context, string) (bool, error) {
+	return false, c.Validate()
+}
+
 func (c disabledClient) Delete(context.Context, string) error {
 	return c.Validate()
 }