fix(orchestrator): reuse src connection to list folders instead of extra TestLogin

internal/imapx/account.go

@@ -2,8 +2,23 @@ package imapx
 
 import (
 	"context"
+
+	"github.com/emersion/go-imap/v2/imapclient"
 )
 
+// ListFolders returns the mailbox names visible on an already-connected, logged-in client.
+func ListFolders(c *imapclient.Client) ([]string, error) {
+	mboxes, err := c.List("", "*", nil).Collect()
+	if err != nil {
+		return nil, err
+	}
+	names := make([]string, 0, len(mboxes))
+	for _, m := range mboxes {
+		names = append(names, m.Mailbox)
+	}
+	return names, nil
+}
+
 func TestLogin(ctx context.Context, ep Endpoint, login, pass string) ([]string, error) {
 	c, err := Connect(ctx, ep)
 	if err != nil {