feat(app): introduce Hall of Fame section and refactor UI

This commit adds the '名人堂' (Hall of Fame) feature and removes the Element Plus dependency.

- feat(content): Add Hall of Fame section with a new content collection, homepage component, and detail pages.
- refactor(join-us): Rewrite the 'Join Us' form to remove Element Plus, using native elements and Reka UI. The form is
temporarily disabled.
- feat(ui): Display cover images on News and Events cards.
- chore: Integrate Umami for web analytics.
- fix: Correct minor text issues, including graduation year in the footer.

app/components/index/HallOfFame.vue

@@ -0,0 +1,31 @@
+<template>
+  <div>
+    <section id="hall-of-fame" class="py-16">
+      <div class="max-w-6xl mx-auto px-4">
+        <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" />
+            <h4 class="text-lg font-bold">{{ person.name }}</h4>
+            <p class="text-sm text-gray-500">{{ person.title }}</p>
+          </div>
+        </div>
+      </div>
+    </section>
+  </div>
+</template>
+
+<script lang="ts" setup>
+const { data: persons } = await useAsyncData('hall-of-fames', () =>
+  queryCollection('hallOfFames')
+    .limit(4)
+    .all()
+)
+
+var router = useRouter()
+const jumpToPersonIntro = (path: string) => {
+  router.push(path)
+}
+</script>
+
+<style></style>