feat(01-01): initialize Nuxt 4 project with all modules

- nuxt.config.ts with compatibilityVersion 4, SSR, 6 modules
- app/app.vue and app/pages/index.vue minimal setup
- pnpm as package manager with all dependencies installed
- TypeScript strict mode enabled
- .gitignore updated for Nuxt (.nuxt, .output, .env)
- tsconfig.json extends .nuxt/tsconfig.json

tsconfig.json

@@ -1,11 +1,3 @@
 {
-  "files": [],
-  "references": [
-    {
-      "path": "./tsconfig.node.json"
-    },
-    {
-      "path": "./tsconfig.app.json"
-    }
-  ]
+  "extends": "./.nuxt/tsconfig.json"
 }