refactor(desktop): code review fixes

- Shortcut: Cmd+Shift+C → Cmd+Shift+M (avoid Chrome DevTools conflict)
- Preload: onData/onExit now return cleanup functions (fix memory leak)
- PTY: resolve shell path at construction time, throw on missing claude CLI
- Terminal: remove allowProposedApi, dedupe resize listeners, add cleanup
- Main: debounce window move config writes (500ms), restart PTY on activate
- CSS: remove unused orbGlow keyframes
- Package: fix appId to com.apaam.myclaude, skip code signing, remove unused deps

README.md

@@ -201,7 +201,7 @@ npm run dev        # 开发模式
 
 **快捷键：**
 
-- `Cmd+Shift+C`（macOS）/ `Ctrl+Shift+C`（Win/Linux）：显示/隐藏宠物
+- `Cmd+Shift+M`（macOS）/ `Ctrl+Shift+M`（Win/Linux）：显示/隐藏宠物
 
 **特性：**