fix(GOV-009): 完成脚手架审查整改

server/libs/infrastructure/src/mysql-health.client.ts

@@ -4,6 +4,7 @@ import type { OnModuleDestroy } from '@nestjs/common';
 import type { MysqlRuntimeConfig } from '../../config/src/runtime-config';
 import type { DependencyHealthDto } from '../../http-contracts/src/health.dto';
 
+/** 固定的只读元数据查询，用于验证服务端版本、库名和会话字符口径。 */
 export const MYSQL_HEALTH_QUERY = `SELECT
   VERSION() AS version,
   DATABASE() AS databaseName,
@@ -24,6 +25,7 @@ interface MysqlMetadataRow {
   timezone: string;
 }
 
+/** MySQL 健康客户端只校验元数据，不读取表数据或执行写入。 */
 export class MysqlHealthClient implements OnModuleDestroy {
   constructor(
     private readonly client: MysqlQueryPort,
@@ -34,7 +36,9 @@ export class MysqlHealthClient implements OnModuleDestroy {
     const [rows] = await this.client.query(MYSQL_HEALTH_QUERY);
     const row = (rows as unknown as MysqlMetadataRow[])[0];
     if (!row) throw new Error('MySQL 未返回元数据');
-    if (!row.version.startsWith('5.7.')) throw new Error('MySQL 5.7.x 版本要求未满足');
+    if (!/^5\.7\.42(?:[-+.]|$)/.test(row.version)) {
+      throw new Error('MySQL 5.7.42 版本要求未满足');
+    }
     if (row.databaseName !== this.expectedDatabase) {
       throw new Error(`MySQL 健康检查必须连接 ${this.expectedDatabase}`);
     }
@@ -46,7 +50,7 @@ export class MysqlHealthClient implements OnModuleDestroy {
 
     return {
       status: 'healthy',
-      detail: `MySQL 5.7 / ${row.databaseName} / ${row.timezone}`,
+      detail: `MySQL 5.7.42 / ${row.databaseName} / ${row.timezone}`,
     };
   }
 
@@ -59,6 +63,7 @@ export class MysqlHealthClient implements OnModuleDestroy {
   }
 }
 
+/** 创建最多两个连接的只读健康池，并显式应用 MySQL 5.7.42 会话时区。 */
 export function createMysqlHealthClient(config: MysqlRuntimeConfig): MysqlHealthClient {
   const pool: Pool = createPool({
     host: config.host,