清理无用主函数，标点名称为空时不予标记

src/main/java/org/example/ImageDotMarker.java

@@ -401,7 +401,7 @@ public class ImageDotMarker extends JFrame {
     private void addNewPoint(Point imgPoint) {
         // 提示用户输入点名称
         String name = JOptionPane.showInputDialog(this, "请输入标记点名称:", "添加标记点", JOptionPane.PLAIN_MESSAGE);
-        if (name == null) return; // 用户取消
+        if (name == null || name.isEmpty()) return; // 用户取消
 
         MarkPoint point = new MarkPoint(imgPoint.x, imgPoint.y, name);
         points.add(point);
@@ -549,13 +549,6 @@ public class ImageDotMarker extends JFrame {
         }
     }
 
-    public static void main(String[] args) {
-        SwingUtilities.invokeLater(() -> {
-            ImageDotMarker app = new ImageDotMarker();
-            app.setVisible(true);
-        });
-    }
-
     // 标记点类，包含坐标和名称
     private static class MarkPoint {
         int x;