feat(音频): 添加CC电脑启动音乐功能

添加简单的C大调音阶作为启动音乐，当检测到扬声器时自动播放

.trae/rules/project_rules.md

@@ -0,0 +1,2 @@
+这个是我的世界模组CC电脑Tweaked版本的操作系统
+所以要用CC Tweaked所支持的lua代码写

data/computercraft/lua/rom/startup/50_audio.lua

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+-- LeonOS Startup Music
+local rc = ...
+local peripheral = require("peripheral")
+local speaker = peripheral.find("speaker")
+
+-- 检查是否连接了扬声器
+if speaker then
+  -- 简单的开机音乐（C大调音阶）
+  local notes = {
+    {note = "C4", duration = 0.25},
+    {note = "D4", duration = 0.25},
+    {note = "E4", duration = 0.25},
+    {note = "F4", duration = 0.25},
+    {note = "G4", duration = 0.25},
+    {note = "A4", duration = 0.25},
+    {note = "B4", duration = 0.25},
+    {note = "C5", duration = 0.5}
+  }
+
+  -- 播放音乐
+  for _, note_info in ipairs(notes) do
+    speaker.playNote(note_info.note)
+    rc.sleep(note_info.duration)
+  end
+end