feat: implement auth middleware, user sync, and token state persistence

- Define useAuth composable logic with syncUser, handleLoginSuccess, and logout methods
- Add auth.ts and guest.ts route middlewares to guard routes based on authentication and user roles
- Add auth.client.ts plugin to boot-sync logged in user details
- Declare custom PageMeta type definitions to support role-based authorization rules

app/types/nuxt.d.ts

@@ -0,0 +1,8 @@
+declare module '#app' {
+  interface PageMeta {
+    auth?: {
+      role?: 'CITIZEN' | 'OPERATOR' | 'ADMIN'
+    }
+  }
+}
+export {}