feat: Implement file upload functionality with MinIO integration

- Added new dependencies for HMAC, hex, and urlencoding in Cargo.toml.
- Introduced FileUploadSchema for handling multipart file uploads.
- Enhanced UsersService with upload_file method to handle file uploads to MinIO.
- Implemented MinioService for managing MinIO interactions, including file uploads and presigned URL generation.
- Updated environment configuration to include MinIO region and secure settings.
- Added validation for file types and sizes during upload.
- Improved error handling and logging for file upload processes.
- Created utility functions for base64 decoding and content type extraction.

.env.example

@@ -41,6 +41,7 @@ MINIO_ENDPOINT=http://localhost:9000
 MINIO_BUCKET_NAME=default_bucket
 MINIO_ACCESS_KEY=your-minio-access-key
 MINIO_SECRET_KEY=your-minio-secret-key
+MINIO_SECURE=false
 
 GOOGLE_CLIENT_ID="your_google_client_id"
 GOOGLE_CLIENT_SECRET="your_google_client_secret"