Chore: project init

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+npm run dev       # Start dev server with HMR (hot module reloading)
+npm run build     # Production build to dist/
+npm run preview   # Preview production build locally
+npm run lint      # Run ESLint on all files
+```
+
+## Tech Stack
+
+- **React 19** with plain JavaScript (no TypeScript)
+- **Vite 7** as build tool (uses `@vitejs/plugin-react` with Babel/Fast Refresh)
+- **ESLint** with react-hooks and react-refresh plugins
+
+## Project Purpose
+
+Frontend for a **Unity 3D multiplayer game deployment**. Target users are testers who need to:
+- Access/log in to the game platform
+- Download the Unity game client
+- Launch and play the multiplayer game
+
+## Project Structure
+
+Currently a minimal Vite + React starter. `src/main.jsx` is the entry point that mounts `src/App.jsx` to `#root`. No routing, state management libraries, or API layer are set up yet — these will be added as the project develops.
+
+## ESLint Config
+
+Uses the new flat config format (`eslint.config.js`). The `no-unused-vars` rule ignores variables matching `^[A-Z_]` (uppercase constants are exempt).