fix: bind S3 credentials to correct environment variables to fix 403 Access Denied

master/src/main/java/com/autopilot/localagent_cloud/service/S3Service.java

@@ -14,16 +14,16 @@ import jakarta.annotation.PostConstruct;
 @Service
 public class S3Service {
 
-    @Value("${aws.s3.bucket:autopilot}")
+    @Value("${S3_BUCKET_NAME:autopilot-screenshots}")
     private String bucketName;
 
-    @Value("${aws.region:ap-south-1}")
+    @Value("${AWS_REGION:ap-south-1}")
     private String region;
 
-    @Value("${aws.access-key:}")
+    @Value("${AWS_ACCESS_KEY_ID:}")
     private String accessKey;
 
-    @Value("${aws.secret-key:}")
+    @Value("${AWS_SECRET_ACCESS_KEY:}")
     private String secretKey;
 
     private S3Client s3Client;