feat(student-bff): 完整实现 student-bff 聚合层

包含 src 全部实现、Dockerfile、shared-ts/bff 包等

services/student-bff/src/app.module.ts

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+/**
+ * AppModule - student-bff 根模块.
+ *
+ * 仲裁依据:
+ *   - coord-final-decisions §2 B1 (GraphQL Yoga + DataLoader)
+ *   - coord-final-decisions §2 B8 (DownstreamClient 抽象复用)
+ *   - coord-final-decisions §1 G8 (GlobalErrorFilter)
+ *
+ * 模块装配:
+ *   - CacheModule (Global): Redis 缓存
+ *   - DownstreamModule (Global): gRPC 下游客户端
+ *   - CircuitBreakerModule (Global): opossum 熔断器 (P6)
+ *   - HealthModule: /healthz + /readyz
+ *   - StudentModule: GraphQL Yoga + Resolver
+ *   - DataLoaderModule: DataLoader 工厂
+ *   - EventModule: Kafka 事件订阅 + push-gateway 推送 (P5)
+ */
+import { Module } from "@nestjs/common";
+import { CacheModule } from "./shared/cache/cache.module.js";
+import { DownstreamModule } from "./shared/downstream/downstream.module.js";
+import { HealthModule } from "./shared/health/health.module.js";
+import { StudentModule } from "./student/student.module.js";
+import { DataLoaderModule } from "./student/dataloaders/data-loader.module.js";
+import { EventModule } from "./student/events/event.module.js";
+import { CircuitBreakerModule } from "./shared/circuit-breaker/circuit-breaker.module.js";
+
+@Module({
+  imports: [
+    CacheModule,
+    DownstreamModule,
+    CircuitBreakerModule,
+    HealthModule,
+    DataLoaderModule,
+    StudentModule,
+    EventModule,
+  ],
+})
+export class AppModule {}