chore: 清理构建产物并更新.gitignore

删除旧的Nuitka构建目录和生成的二进制文件
将build_nuitka/添加到.gitignore中避免误提交

video_downloader.py

@@ -0,0 +1,20 @@
+import tkinter as tk
+from src.ui.app import DouyinDownloaderApp
+
+# 运行脚本 (使用 my_env 环境):
+# D:\ProgramData\anaconda3\envs\my_env\python.exe "D:\Code\doing_exercises\programs\Video Downloader\video_downloader.py"
+#
+# 打包成 exe (使用 my_env 环境):
+# D:\ProgramData\anaconda3\envs\my_env\python.exe -m nuitka --standalone --mingw64 --show-memory --show-progress --output-dir=build_nuitka --enable-plugin=tk-inter --include-data-dir=ico=ico --windows-icon-from-ico=ico\video_downloader.ico --main=video_downloader.py
+
+# 主函数入口
+if __name__ == "__main__":
+    try:
+        root = tk.Tk()
+        app = DouyinDownloaderApp(root)
+        root.mainloop()
+    except Exception as e:
+        import traceback
+
+        with open("error_log.txt", "w") as f:
+            f.write(traceback.format_exc())