feat(卡点分析): 后台卡点分析按知识点 → 题 → 一道题重做，年度趋势改名历年概况只留逐学年总表

- 选班后只列这个班课上布置过的题，右栏换成「交了几次才对」和交得最多的人
- 历年概况可以导出表格；旧地址 top_ac_trend 跳到新页面

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/routes.ts

@@ -310,11 +310,13 @@ export const admins: RouteRecordRaw = {
       meta: { requiresTeacherAdmin: true },
     },
     {
-      path: "problem/top_ac_trend",
-      name: "admin top ac trend",
-      component: () => import("admin/problem/TopACTrend.vue"),
+      path: "problem/yearly",
+      name: "admin yearly overview",
+      component: () => import("admin/problem/Yearly.vue"),
       meta: { requiresTeacherAdmin: true },
     },
+    // 「年度趋势」改名「历年概况」之前的地址，收藏夹里可能还有
+    { path: "problem/top_ac_trend", redirect: "/admin/problem/yearly" },
     // 题单管理路由
     {
       path: "problemset/list",