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/api/src/queue.ts

@@ -1,6 +1,7 @@
 import { Queue } from "bullmq"
 
 import { judgeQueueName, type JudgeJobData } from "./judge/job"
+import { flowchartQueueName, type FlowchartJobData } from "./flowchart/job"
 import { createBlockingRedis } from "./redis"
 
 export const judgeQueue = new Queue<JudgeJobData>(judgeQueueName, {
@@ -10,3 +11,13 @@ export const judgeQueue = new Queue<JudgeJobData>(judgeQueueName, {
     removeOnFail: 500,
   },
 })
+
+export const flowchartQueue = new Queue<FlowchartJobData>(flowchartQueueName, {
+  connection: createBlockingRedis(),
+  defaultJobOptions: {
+    attempts: 3,
+    backoff: { type: "exponential", delay: 2_000 },
+    removeOnComplete: 100,
+    removeOnFail: 500,
+  },
+})