chore(04-01): install and configure Vitest test infrastructure for apps/web

- Add vitest, @testing-library/react, @testing-library/jest-dom, jsdom, @vitejs/plugin-react as dev deps
- Create vitest.config.ts with jsdom environment and @ path alias
- Create test setup file importing jest-dom/vitest matchers
- Add test scripts to apps/web and root package.json
- Add test task to turbo.json pipeline

package.json

@@ -6,6 +6,7 @@
     "dev": "turbo dev",
     "build": "turbo build",
     "lint": "turbo lint",
+    "test": "turbo test",
     "type-check": "turbo type-check"
   },
   "devDependencies": {