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/env.ts

@@ -2,6 +2,7 @@ import { z } from "zod";
 
 const envSchema = z.object({
   PORT: z.string().default("3004"),
+  GRPC_PORT: z.string().default("50053"),
   DATABASE_URL: z.string().url(),
   REDIS_URL: z.string().url().optional(),
   JWT_SECRET: z.string().optional(),
@@ -23,7 +24,7 @@ export function loadEnv(): Env {
   const result = envSchema.safeParse(process.env);
   if (!result.success) {
     console.error(
-      "❌ Invalid environment variables:",
+      "Invalid environment variables:",
       result.error.flatten().fieldErrors,
     );
     throw new Error("Invalid environment configuration");