feat(admin): add initial admin dashboard structure

This commit introduces the foundational structure for the new admin dashboard.

- Utilizes @nuxt/ui to build the dashboard layout, including a collapsible sidebar and navigation.
- Adds initial pages for the dashboard, news, events, and hall of fame management.
- Implements a composable `useDashboardSidebarLinks` for managing sidebar navigation.
- Refactors the default layout by integrating the header and footer directly.
- Swaps the primary and secondary theme colors across the application.

app/components/index/HallOfFame.vue

@@ -5,7 +5,7 @@
         <h3 class="text-2xl font-bold text-center text-gray-900 mb-6">名人堂</h3>
         <div class="grid md:grid-cols-4 gap-6">
           <div v-for="person in persons" :key="person.id" class="flex flex-col items-center cursor-pointer transition hover:scale-105 hover:drop-shadow-2xl hover:-translate-y-1" @click="jumpToPersonIntro(person.path)">
-            <img :src="person.photo" :alt="person.name" class="w-40 rounded-full border-secondary border-4" />
+            <img :src="person.photo" :alt="person.name" class="w-40 rounded-full border-primary border-4" />
             <h4 class="text-lg font-bold">{{ person.name }}</h4>
             <p class="text-sm text-gray-500">{{ person.title }}</p>
           </div>