feat(teacher-bff): 完整实现 teacher-bff GraphQL 聚合层

包含 clients/graphql/middleware、health probes、shared-ts contracts 等

services/teacher-bff/src/teacher/teacher.module.ts

@@ -1,9 +1,11 @@
-import { Module } from '@nestjs/common';
-import { TeacherController } from './teacher.controller.js';
-import { TeacherService } from './teacher.service.js';
+// Teacher 模块（B1 裁决：P2 起 GraphQL，不再使用 REST Controller）
+import { Module } from "@nestjs/common";
+import { TeacherService } from "./teacher.service.js";
+import { ClientsModule } from "../clients/clients.module.js";
 
 @Module({
-  controllers: [TeacherController],
+  imports: [ClientsModule],
   providers: [TeacherService],
+  exports: [TeacherService],
 })
 export class TeacherModule {}