feat: add ftp root path setting

internal/application/capture_ftp.go

@@ -40,9 +40,9 @@ type CaptureAndFTPService struct {
 	Cfg       domain.FTPConfig
 }
 
-// ExecuteWithBytes uploads previously captured PNG bytes and copies the exact
-// remote path semantics shown in Settings: FTP paths are rooted at "/", while
-// SFTP paths are relative to the authenticated user's home directory.
+// ExecuteWithBytes uploads previously captured PNG bytes and copies a display
+// path built from the configured root directory plus the uploaded relative
+// path. RootDirectory deliberately does not affect the upload destination.
 func (s *CaptureAndFTPService) ExecuteWithBytes(ctx context.Context, pngBytes []byte) error {
 	if s.Uploader == nil {
 		s.notifyFailure("FTP/SFTP not configured")
@@ -80,7 +80,7 @@ func (s *CaptureAndFTPService) ExecuteWithBytes(ctx context.Context, pngBytes []
 		return err
 	}
 
-	clipText := ftpShareText(protocol, relPath)
+	clipText := ftpShareText(protocol, s.Cfg.RootDirectory, relPath)
 	if s.Clipboard != nil {
 		if err := s.Clipboard.WriteText(clipText); err != nil {
 			s.notifyFailure("clipboard write failed: " + err.Error())
@@ -131,11 +131,16 @@ func normalizedFTPProtocol(protocol string) string {
 	return domain.FTPProtocolFTP
 }
 
-func ftpShareText(protocol, relPath string) string {
-	if protocol == domain.FTPProtocolSFTP {
-		return "~/" + relPath
+func ftpShareText(protocol, rootDirectory, relPath string) string {
+	rootDirectory = strings.TrimSpace(rootDirectory)
+	if rootDirectory == "" {
+		if protocol == domain.FTPProtocolSFTP {
+			rootDirectory = "~/"
+		} else {
+			rootDirectory = "/"
+		}
 	}
-	return "/" + relPath
+	return strings.TrimRight(rootDirectory, "/") + "/" + strings.TrimLeft(relPath, "/")
 }
 
 func (s *CaptureAndFTPService) notifyFailure(reason string) {