在首次教程战斗中(与银狐的战斗)，加入战斗系统的各项要素说明及提示
加入可全屏调整(保持比例)，但全屏后像素显示会受到影响
修复部分bug

In the initial tutorial battle (against Silver Fox), include explanations and prompts for all elements of the battle system.
Implement fullscreen capability (maintaining aspect ratio), although pixel display may be affected when in fullscreen mode.
Fix some bugs