fix minio

BMA.EHR.Application/Repositories/MinIOExamService.cs

@@ -1,4 +1,4 @@
-using Amazon.S3;
+using Amazon.S3;
 using Amazon.S3.Model;
 using BMA.EHR.Domain.Models.Documents;
 using BMA.EHR.Domain.Shared;
@@ -40,7 +40,9 @@ namespace BMA.EHR.Application.Repositories
             var config = new AmazonS3Config
             {
                 ServiceURL = _configuration["MinIO:Endpoint"],
-                ForcePathStyle = true
+                ForcePathStyle = true,
+                SignatureVersion = "V4", // รองรับ MinIO
+                AuthenticationRegion = "th-middle-rack-1" // บาง MinIO ใช้ region "us-east-1" โดย default
             };
 
             _s3Client = new AmazonS3Client(_configuration["MinIO:AccessKey"], _configuration["MinIO:SecretKey"], config);