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/minio.go

@@ -135,6 +135,32 @@ func (c *minioClient) GetBytes(ctx context.Context, objectKey string) ([]byte, e
 	return data, nil
 }
 
+func (c *minioClient) Exists(ctx context.Context, objectKey string) (bool, error) {
+	if err := c.Validate(); err != nil {
+		return false, err
+	}
+	if strings.TrimSpace(objectKey) == "" {
+		return false, nil
+	}
+
+	_, err := c.client.StatObject(ctx, c.bucket, objectKey, minio.StatObjectOptions{})
+	if err == nil {
+		return true, nil
+	}
+
+	responseErr := minio.ToErrorResponse(err)
+	if responseErr.StatusCode == 404 || responseErr.Code == "NoSuchKey" || responseErr.Code == "NoSuchObject" {
+		return false, nil
+	}
+
+	c.logError(ctx, "minio stat object failed",
+		zap.String("bucket", c.bucket),
+		zap.String("object_key", objectKey),
+		zap.Error(err),
+	)
+	return false, fmt.Errorf("stat minio object: %w", err)
+}
+
 func (c *minioClient) Delete(ctx context.Context, objectKey string) error {
 	if err := c.Validate(); err != nil {
 		return err