feat(auth): scaffold auth pages and guards

- Add Pinia auth store, types, and auth service (mocked)
- Add login/register/verify/forgot password views and dashboard
- Add reusable auth UI components (card, inputs, buttons)
- Add router guards and protected routing wiring
- Disable vue devtools plugin by default to avoid Node localStorage crash
- Update dependencies for cookie handling
- Comment out Umami script in index.html

Made-with: Cursor

package.json

@@ -13,7 +13,9 @@
     "format": "prettier --write src/"
   },
   "dependencies": {
+    "@types/js-cookie": "^3.0.6",
     "@vueuse/head": "^2.0.0",
+    "js-cookie": "^3.0.5",
     "pinia": "^3.0.1",
     "vue": "^3.5.13",
     "vue-i18n": "^9.14.4",