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/configs/config.local.yaml.example

@@ -25,9 +25,26 @@ object_storage:
   endpoint: localhost:9000
   bucket: geo-private
   use_ssl: false
+  public_base_url: ""
+  region: ""
   # Prefer environment override for secrets:
   # export OBJECT_STORAGE_ACCESS_KEY=minioadmin
   # export OBJECT_STORAGE_SECRET_KEY=minioadmin
+  # MinIO example:
+  # provider: minio
+  # endpoint: localhost:9000
+  # bucket: geo-private
+  # use_ssl: false
+  #
+  # Aliyun OSS example:
+  # provider: aliyun
+  # endpoint: https://oss-cn-hangzhou.aliyuncs.com
+  # bucket: your-bucket
+  # region: cn-hangzhou
+  # use_ssl: true
+  # public_base_url: https://your-bucket.oss-cn-hangzhou.aliyuncs.com
+  # export OBJECT_STORAGE_ACCESS_KEY=your-access-key
+  # export OBJECT_STORAGE_SECRET_KEY=your-secret-key
 
 jwt:
   secret: "your-local-secret"