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/flowchart/run.ts

@@ -0,0 +1,77 @@
+import { flowchartUpdateSchema } from "@oj2/contract"
+import { eq } from "drizzle-orm"
+
+import { db, schema } from "../db"
+import { publishFlowchartUpdate } from "../events"
+import { completeChat } from "../services/ai"
+import type { FlowchartJobData } from "./job"
+
+function evaluationPrompt(problem: typeof schema.problem.$inferSelect) {
+  return `你是专业的编程教学助手，负责评估学生的 Mermaid 流程图。
+评分：逻辑正确性40分、完整性30分、规范性20分、清晰度10分。
+不要评价系统生成的节点ID。feedback不超过100字；suggestions最多3条且只针对真实问题。
+返回纯 JSON：{"score":85,"grade":"A","feedback":"...","suggestions":"...","criteria_details":{}}。
+等级：S=90-100，A=80-89，B=70-79，C=0-69。
+题目：${problem.title}\n${problem.description.slice(0, 2000)}`
+}
+
+function parseEvaluation(value: string) {
+  const block = value.match(/```(?:json)?\s*([\s\S]*?)```/)?.[1]
+  const json = block ?? value.match(/\{[\s\S]*\}/)?.[0]
+  if (!json) throw new Error("AI response did not contain JSON")
+  const data = JSON.parse(json) as Record<string, unknown>
+  if (typeof data.score !== "number" || typeof data.grade !== "string") throw new Error("AI response is missing score or grade")
+  return {
+    score: Math.max(0, Math.min(100, data.score)),
+    grade: data.grade,
+    feedback: typeof data.feedback === "string" ? data.feedback : "",
+    suggestions: typeof data.suggestions === "string" ? data.suggestions : "",
+    criteria: data.criteria_details && typeof data.criteria_details === "object" ? data.criteria_details : {},
+  }
+}
+
+export async function evaluateFlowchart(job: FlowchartJobData) {
+  const [row] = await db.select({ flowchart: schema.flowchartSubmission, problem: schema.problem }).from(schema.flowchartSubmission)
+    .innerJoin(schema.problem, eq(schema.flowchartSubmission.problemId, schema.problem.id))
+    .where(eq(schema.flowchartSubmission.id, job.submissionId)).limit(1)
+  if (!row || ![0, 1].includes(row.flowchart.status)) return
+  await db.update(schema.flowchartSubmission).set({ status: 1 }).where(eq(schema.flowchartSubmission.id, row.flowchart.id))
+  const started = performance.now()
+  try {
+    const reference = row.problem.mermaidCode ? `\n标准答案参考：\n${row.problem.mermaidCode}` : "\n此题没有标准流程图。"
+    const result = parseEvaluation(await completeChat(
+      evaluationPrompt(row.problem),
+      `学生流程图：\n${row.flowchart.mermaidCode}${reference}\n设计提示：${row.problem.flowchartHint ?? "无"}`,
+    ))
+    await db.update(schema.flowchartSubmission).set({
+      status: 2,
+      aiScore: result.score,
+      aiGrade: result.grade,
+      aiFeedback: result.feedback,
+      aiSuggestions: result.suggestions,
+      aiCriteriaDetails: result.criteria,
+      aiProvider: "deepseek",
+      aiModel: process.env.AI_MODEL ?? "deepseek-v4-flash",
+      processingTime: (performance.now() - started) / 1000,
+      evaluationTime: new Date().toISOString(),
+    }).where(eq(schema.flowchartSubmission.id, row.flowchart.id))
+    await publishFlowchartUpdate(row.flowchart.userId, flowchartUpdateSchema.parse({
+      type: "flowchart_evaluation_completed",
+      submission_id: row.flowchart.id,
+      score: result.score,
+      grade: result.grade,
+      feedback: result.feedback,
+      suggestions: result.suggestions,
+      criteriaDetails: result.criteria,
+    }))
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error)
+    await db.update(schema.flowchartSubmission).set({ status: 3 }).where(eq(schema.flowchartSubmission.id, row.flowchart.id))
+    await publishFlowchartUpdate(row.flowchart.userId, flowchartUpdateSchema.parse({
+      type: "flowchart_evaluation_failed",
+      submission_id: row.flowchart.id,
+      error: message,
+    }))
+    throw error
+  }
+}