feat(core-edu): 完整实现 core-edu 教学核心服务

包含 classes/exams/homework/grades/attendance/scheduling 域、outbox、iam-consumer、redis 配置等完整实现

services/core-edu/src/config/kafka.ts

@@ -1,5 +1,6 @@
 import { Kafka } from "kafkajs";
 import { env } from "./env.js";
+import { logger } from "../shared/observability/logger.js";
 
 export const kafka = new Kafka({
   brokers: env.KAFKA_BROKERS.split(","),
@@ -13,15 +14,35 @@ export const producer = kafka.producer({
 
 export const consumer = kafka.consumer({ groupId: "core-edu-group" });
 
+let producerConnected = false;
+let consumerConnected = false;
+
+producer.on("producer.connect", () => {
+  producerConnected = true;
+});
+producer.on("producer.disconnect", () => {
+  producerConnected = false;
+});
+consumer.on("consumer.connect", () => {
+  consumerConnected = true;
+});
+consumer.on("consumer.disconnect", () => {
+  consumerConnected = false;
+});
+
+export function isKafkaConnected(): boolean {
+  return producerConnected && consumerConnected;
+}
+
 export async function connectKafka(): Promise<void> {
   try {
     await producer.connect();
     await consumer.connect();
-    console.log("Kafka connected");
+    logger.info("Kafka connected");
   } catch (err) {
-    console.warn(
-      "Kafka connect failed, running without Kafka:",
-      err instanceof Error ? err.message : String(err),
+    logger.warn(
+      { err: err instanceof Error ? err.message : String(err) },
+      "Kafka connect failed, running without Kafka",
     );
   }
 }