fix(achievement): 奖杯馆取 ApiResponse.data 而非整个响应对象

http 客户端返回 ApiResponse<T>，载荷在 .data 里。
原写法会让页面拿到 undefined，奖杯馆整片空白。
项目没有类型检查步骤，Vite 只转译不校验，构建不会报这个错。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/oj/achievement/index.vue

@@ -40,9 +40,10 @@ async function load() {
       getAchievementSummary(name.value),
       getUserBadges(name.value),
     ])
-    achievements.value = list.achievements
+    // http 客户端返回 ApiResponse<T>，真实载荷在 .data 里
-    summary.value = sum
+    achievements.value = list.data.achievements
-    badges.value = (badgeRes ?? []) as UserBadge[]
+    summary.value = sum.data
+    badges.value = (badgeRes.data ?? []) as UserBadge[]
   } finally {
     loading.value = false
   }