feat(entities): 集成 MikroORM 并配置实体文件规则

- 添加 MikroORM CLI 和实体生成器依赖包
- 配置 ESLint 规则以适配 MikroORM 生成的实体文件
- 添加 mikro-orm 和 generate-entities 命令脚本
- 更新 pnpm 锁定文件包含新依赖项
- 移除手动创建的 meeting-user 实体文件，改用 ORM 自动生成

node_api/src/entities/IcrHomeworkanswerdraftcoordinate.ts

@@ -0,0 +1,24 @@
+import { PrimaryKeyProp, defineEntity, p } from '@mikro-orm/core';
+
+export class IcrHomeworkanswerdraftcoordinate {
+  [PrimaryKeyProp]?: 'Id';
+  Id!: bigint;
+  HomeworkAnswerDraftId!: bigint;
+  Content?: unknown;
+  Revision!: number;
+  CreatedBy?: bigint;
+  CreatedTime!: Date;
+}
+
+export const IcrHomeworkanswerdraftcoordinateSchema = defineEntity({
+  class: IcrHomeworkanswerdraftcoordinate,
+  comment: '作业草稿纸',
+  properties: {
+    Id: p.bigint().primary().name('Id').unsigned(false).autoincrement(false).comment('主键Id'),
+    HomeworkAnswerDraftId: p.bigint().name('HomeworkAnswerDraftId'),
+    Content: p.array().name('Content').length(4294967295).nullable(),
+    Revision: p.integer().name('Revision').comment('乐观锁'),
+    CreatedBy: p.bigint().name('CreatedBy').nullable().comment('创建者用户Id'),
+    CreatedTime: p.datetime().name('CreatedTime').length(3).comment('创建时间'),
+  },
+});