feat: add ESLint and Prettier with pre-commit hook

- Install ESLint 9 with TypeScript and React support
- Install Prettier with custom configuration (no semicolons)
- Add husky and lint-staged for pre-commit hooks
- Configure lint-staged to auto-fix and format on commit
- Relax ESLint rules to avoid large-scale code changes
- Format all existing code with Prettier (no semicolons)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/main.tsx

@@ -6,5 +6,5 @@ import './index.css'
 ReactDOM.createRoot(document.getElementById('root')!).render(
   <React.StrictMode>
     <App />
-  </React.StrictMode>,
+  </React.StrictMode>
 )