feat: add image upload functionality for articles

- Implemented image upload API in the article service, allowing users to upload images associated with articles.
- Added validation for image size and type, ensuring only supported formats (PNG, JPG, GIF, WebP) are accepted.
- Created a new Aliyun object storage client to handle image storage and retrieval.
- Updated the article handler to include an endpoint for image uploads.
- Enhanced error handling for image upload failures and added relevant error messages.
- Introduced public URL generation for stored images, allowing access via signed tokens.
- Updated localization files to include new messages related to image upload functionality.
- Added tests for image upload and retrieval processes.

server/internal/shared/objectstorage/minio.go

@@ -20,6 +20,7 @@ type minioClient struct {
 	bucket string
 	region string
 	logger *zap.Logger
+	cfg    config.ObjectStorageConfig
 }
 
 func NewMinIOClient(cfg config.ObjectStorageConfig, logger *zap.Logger) Client {
@@ -45,6 +46,7 @@ func NewMinIOClient(cfg config.ObjectStorageConfig, logger *zap.Logger) Client {
 		bucket: bucket,
 		region: strings.TrimSpace(cfg.Region),
 		logger: logger,
+		cfg:    cfg,
 	}
 }
 
@@ -153,6 +155,13 @@ func (c *minioClient) Delete(ctx context.Context, objectKey string) error {
 	return nil
 }
 
+func (c *minioClient) PublicURL(objectKey string) (string, error) {
+	if err := c.Validate(); err != nil {
+		return "", err
+	}
+	return buildPublicURL(c.cfg, objectKey, false)
+}
+
 func (c *minioClient) logError(ctx context.Context, msg string, fields ...zap.Field) {
 	if c == nil || c.logger == nil {
 		return