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

src/useBoard/useBoard.ts

@@ -0,0 +1,19 @@
+import { useRef } from "react";
+
+export function useBoard() {
+  const containerRef = useRef<HTMLDivElement | null>(null);
+
+  const renderBoard = () => {
+    const container = containerRef.current;
+    if (!container) return;
+
+    // TODO: Implement board rendering
+  };
+
+  return {
+    containerRef,
+    renderBoard,
+  };
+}
+
+export type UseBoardType = ReturnType<typeof useBoard>;