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.

content.config.ts

@@ -11,6 +11,7 @@ export default defineContentConfig({
         subtitle: z.string(),
         date: z.coerce.date(),
         location: z.string(),
+        cover: z.string().url(),
       }),
     }),
     // 新闻集合
@@ -32,5 +33,17 @@ export default defineContentConfig({
         ogImage: z.string().optional(),
       }),
     }),
+    // 名人堂
+    hallOfFames: defineCollection({
+      type: "page",
+      source: "hall-of-fames/*md",
+      schema: z.object({
+        name: z.string(),
+        photo: z.string().url(),
+        title: z.string(),
+        description: z.string(),
+        gallery: z.array(z.string()),
+      }),
+    }),
   },
 });