feat(阶段3): oj 侧端点铺开（基线提交，未经评审）

由外部 agent (Codex) 在本会话额度中断期间完成。原样提交作为基线，
后续修复单独成 commit，便于区分与回退。

覆盖 oj 侧 65 个端点，新增 9 组路由（account/achievement/ai/classroom/
content/contest/flowchart/problemset/site）与对应 Zod 契约。

已核验：tsc --noEmit 退出码 0；API 可启动；/api/problems 返回真实数据；
judge 与 flowchart worker 均 ready。
未核验：权限边界与数据泄露，评审进行中。

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

apps/web/src/oj/achievement/api.ts

@@ -1,4 +1,4 @@
-import http from "utils/http"
+import api2 from "utils/api2"
 import type {
   Achievement,
   AchievementSummary,
@@ -6,22 +6,30 @@ import type {
 } from "utils/types"
 
 export function getAchievements(name?: string) {
-  return http.get<{ username: string; achievements: Achievement[] }>(
-    "achievements",
-    { params: name ? { name } : {} },
-  )
+  return api2.get<any>("achievements", { params: name ? { username: name } : {} })
+    .then((response) => ({
+      ...response,
+      data: {
+        username: response.data.username,
+        achievements: response.data.achievements.map((item: any): Achievement => ({
+          ...item,
+          unlock_time: item.unlockTime,
+          unlock_rate: item.unlockRate,
+        })),
+      },
+    }))
 }
 
 export function getAchievementSummary(name?: string) {
-  return http.get<AchievementSummary>("achievements/summary", {
-    params: name ? { name } : {},
+  return api2.get<AchievementSummary>("achievements/summary", {
+    params: name ? { username: name } : {},
   })
 }
 
 export function getPendingAchievements() {
-  return http.get<PendingAchievement[]>("achievements/pending")
+  return api2.get<PendingAchievement[]>("achievements/pending")
 }
 
 export function markAchievementsRead(ids: number[]) {
-  return http.post("achievements/pending", { ids })
+  return api2.post("achievements/pending/read", { ids })
 }