feat(core-edu): v2 P3.14 考试实时事件 + pino 修复

新增 3 RPC：ExtendExam/ForceSubmitExam/ReorderExamQuestions

新增 3 Kafka 事件：exam.extended/exam.force_submitted/exam.question_reordered

exams.service.ts 新增 3 方法 + Outbox 事务内写入 + TOPIC_MAP 映射

grpc.server.ts 注册 3 handler + grpc-smoke 测试

logger.ts pino 导入修复（import pino → import { pino }）

27/27 smoke test 通过

services/core-edu/src/shared/observability/logger.ts

@@ -1,15 +1,15 @@
-import pino from 'pino';
-import { env } from '../../config/env.js';
+import { pino } from "pino";
+import { env } from "../../config/env.js";
 
 export const logger = pino({
-  name: 'core-edu',
+  name: "core-edu",
   level: env.LOG_LEVEL,
-  base: { service: 'core-edu' },
-  ...(env.NODE_ENV === 'development'
+  base: { service: "core-edu" },
+  ...(env.NODE_ENV === "development"
     ? {
         transport: {
-          target: 'pino-pretty',
-          options: { colorize: true, translateTime: 'SYS:standard' },
+          target: "pino-pretty",
+          options: { colorize: true, translateTime: "SYS:standard" },
         },
       }
     : {}),