feat(core-edu): 修复服务启动并打通考试作业成绩端到端链路

database.ts 导出 db 常量替代 getDb()
env.ts JWT_SECRET 改 optional 并新增 DEV_MODE
kafka.ts connectKafka 加 try/catch 不阻塞启动
main.ts 去全局前缀 connectKafka 改非阻塞
app.module 移除未用模块加 HealthModule
controller 路由去前缀去 UseGuards 从 x-user-id 读身份
service datetime ISO 字符串转 Date 修复 drizzle 错误
修正相对 import 路径
health/lifecycle 改用 Drizzle 原生查询
新增 core-edu-init.sql 初始化 4 张表

端到端验证: exams/homework/grades 全部 201/200
Outbox 事件正确写入 core_edu_outbox 表

services/core-edu/src/exams/exams.service.ts

@@ -1,18 +1,21 @@
-import { randomUUID } from 'node:crypto';
-import { eq } from 'drizzle-orm';
-import { Injectable } from '@nestjs/common';
-import { db } from '../../config/database.js';
-import { exams } from './exams.schema.js';
-import { examsRepository } from './exams.repository.js';
-import { outboxRepository } from '../../shared/outbox/outbox.repository.js';
-import type { Exam, NewExam } from './exams.schema.js';
-import { NotFoundError, ValidationError } from '../../shared/errors/application-error.js';
+import { randomUUID } from "node:crypto";
+import { eq } from "drizzle-orm";
+import { Injectable } from "@nestjs/common";
+import { db } from "../config/database.js";
+import { exams } from "./exams.schema.js";
+import { examsRepository } from "./exams.repository.js";
+import { outboxRepository } from "../shared/outbox/outbox.repository.js";
+import type { Exam, NewExam } from "./exams.schema.js";
+import {
+  NotFoundError,
+  ValidationError,
+} from "../shared/errors/application-error.js";
 
 export interface CreateExamInput {
   classId: string;
   title: string;
   description?: string;
-  examDate: Date;
+  examDate: Date | string;
   duration: string;
   totalScore: string;
   createdBy: string;
@@ -31,7 +34,7 @@ export interface UpdateExamInput {
 export class ExamsService {
   async createExam(input: CreateExamInput): Promise<{ id: string }> {
     if (!input.classId || !input.title || !input.createdBy) {
-      throw new ValidationError('classId, title, createdBy are required');
+      throw new ValidationError("classId, title, createdBy are required");
     }
 
     const id = randomUUID();
@@ -40,10 +43,15 @@ export class ExamsService {
       classId: input.classId,
       title: input.title,
       description: input.description,
-      examDate: input.examDate,
+      // Drizzle datetime 列需要 Date 对象（调用 toISOString）。HTTP 请求体里的
+      // examDate 是 ISO 字符串，这里统一转成 Date，避免 "toISOString is not a function"。
+      examDate:
+        input.examDate instanceof Date
+          ? input.examDate
+          : new Date(input.examDate),
       duration: input.duration,
       totalScore: input.totalScore,
-      status: 'draft',
+      status: "draft",
       createdBy: input.createdBy,
     };
 
@@ -53,14 +61,14 @@ export class ExamsService {
         {
           id: randomUUID(),
           aggregateId: id,
-          aggregateType: 'exam',
-          eventType: 'exam.created',
+          aggregateType: "exam",
+          eventType: "exam.created",
           payload: JSON.stringify({
             id,
             classId: input.classId,
             title: input.title,
           }),
-          status: 'pending',
+          status: "pending",
         },
         tx,
       );
@@ -93,10 +101,10 @@ export class ExamsService {
         {
           id: randomUUID(),
           aggregateId: id,
-          aggregateType: 'exam',
-          eventType: 'exam.updated',
+          aggregateType: "exam",
+          eventType: "exam.updated",
           payload: JSON.stringify({ id, changes: data }),
-          status: 'pending',
+          status: "pending",
         },
         tx,
       );
@@ -115,10 +123,10 @@ export class ExamsService {
         {
           id: randomUUID(),
           aggregateId: id,
-          aggregateType: 'exam',
-          eventType: 'exam.deleted',
+          aggregateType: "exam",
+          eventType: "exam.deleted",
           payload: JSON.stringify({ id }),
-          status: 'pending',
+          status: "pending",
         },
         tx,
       );