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.

package.json

@@ -10,8 +10,6 @@
     "postinstall": "nuxt prepare"
   },
   "dependencies": {
-    "@element-plus/icons-vue": "^2.3.2",
-    "@element-plus/nuxt": "1.1.4",
     "@nuxt/content": "3.7.1",
     "@nuxt/image": "1.11.0",
     "@nuxt/ui": "4.0.0",
@@ -21,10 +19,12 @@
     "html2pdf.js": "^0.12.1",
     "maska": "^3.2.0",
     "nuxt": "^4.1.2",
+    "reka-ui": "^2.5.1",
     "tailwindcss": "^4.1.13",
     "typescript": "^5.9.2",
     "vue": "^3.5.22",
-    "vue-router": "^4.5.1"
+    "vue-router": "^4.5.1",
+    "vue-sonner": "^2.0.9"
   },
   "devDependencies": {
     "sass-embedded": "^1.93.2"