chore: initialize typing-chud project with Unified API structure

- Copy vim-snake structure stripped of game-specific logic
- Remove finalScore calculation (raw data only)
- Setup example app with keybinding state management
- Empty board renders and waits for game logic

example/src/useMounted.ts

@@ -0,0 +1,11 @@
+import { useState, useEffect } from 'react';
+
+export const useMounted = () => {
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => {
+    setMounted(true);
+  }, []);
+
+  return mounted;
+};