fix: Consolidate Hetzner support under SFTP provider

- Updated the rclone connection logic to treat Hetzner as an SFTP provider, simplifying the configuration process.
- Removed redundant case handling for Hetzner, streamlining the code and enhancing maintainability.

internal/rclone_service/rclone_service.go

@@ -90,6 +90,10 @@ func TestRcloneConnection(config db.TransferConfig, providerType string, dbInsta
 		rclonePath = "rclone"
 	}
 
+	if provider == "hetzner" {
+		provider = "sftp"
+	}
+
 	createArgs := []string{
 		"config", "create", remoteName, provider,
 		"--config", tempConfigPath,
@@ -105,7 +109,7 @@ func TestRcloneConnection(config db.TransferConfig, providerType string, dbInsta
 	var createCmd *exec.Cmd
 
 	switch provider {
-	case "sftp":
+	case "sftp", "hetzner":
 		createArgs = append(createArgs, "host", host, "user", user)
 		if port != 0 {
 			createArgs = append(createArgs, "port", fmt.Sprintf("%d", port))
@@ -116,17 +120,6 @@ func TestRcloneConnection(config db.TransferConfig, providerType string, dbInsta
 		if keyFile != "" {
 			createArgs = append(createArgs, "key_file", keyFile)
 		}
-	case "hetzner":
-		createArgs = append(createArgs, "host", host, "user", user, "pass", pass, "key_file", keyFile)
-		if port != 0 {
-			createArgs = append(createArgs, "port", fmt.Sprintf("%d", port))
-		}
-		if pass != "" {
-			createArgs = append(createArgs, "pass", pass)
-		}
-		if keyFile != "" {
-			createArgs = append(createArgs, "key_file", keyFile)
-		}
 	case "s3":
 		createArgs = append(createArgs, "provider", "AWS", "env_auth", "false")
 		if accessKey != "" {