🔧 chore: add root ESLint config and enable lint in pre-commit

- Add eslint.config.mjs at root with TypeScript/JS rules
- Configure lint-staged to run ESLint --fix on JS/TS files
- Add ESLint dependencies to root package.json
- Set "type": "module" in package.json to fix module warning
- Ignore projects with their own ESLint configs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lint-staged.config.js

@@ -1,3 +1,4 @@
 export default {
-	'*.{ts,tsx,js,jsx,json,md,svelte,astro}': ['prettier --config .prettierrc.json --write'],
+	'*.{ts,tsx,js,jsx,mjs,cjs}': ['eslint --fix', 'prettier --config .prettierrc.json --write'],
+	'*.{json,md,svelte,astro}': ['prettier --config .prettierrc.json --write'],
 };