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/worker.ts

@@ -3,6 +3,8 @@ import { Worker } from "bullmq"
 import { config } from "./config"
 import { judgeQueueName, type JudgeJobData } from "./judge/job"
 import { judgeSubmission } from "./judge/run"
+import { flowchartQueueName, type FlowchartJobData } from "./flowchart/job"
+import { evaluateFlowchart } from "./flowchart/run"
 import { createBlockingRedis } from "./redis"
 
 const worker = new Worker<JudgeJobData>(
@@ -14,6 +16,12 @@ const worker = new Worker<JudgeJobData>(
   },
 )
 
+const flowchartWorker = new Worker<FlowchartJobData>(
+  flowchartQueueName,
+  async (job) => evaluateFlowchart(job.data),
+  { connection: createBlockingRedis(), concurrency: 2 },
+)
+
 worker.on("ready", () => {
   console.log(`Judge worker ready (concurrency=${config.judgeConcurrency})`)
 })
@@ -23,9 +31,13 @@ worker.on("failed", (job, error) => {
 worker.on("error", (error) => {
   console.error("Judge worker error", error)
 })
+flowchartWorker.on("ready", () => console.log("Flowchart worker ready (concurrency=2)"))
+flowchartWorker.on("failed", (job, error) => console.error(`Flowchart job ${job?.id ?? "unknown"} failed`, error))
+flowchartWorker.on("error", (error) => console.error("Flowchart worker error", error))
 
 async function shutdown() {
   await worker.close()
+  await flowchartWorker.close()
   process.exit(0)
 }