docs(migration): 添加清渊传奇PHP到Vue+Node.js移植计划文档

- 新增 MIGRATION.md 详细记录PHP到Node.js架构迁移方案
- 包含项目背景、现有资产盘点、架构设计、任务清单等完整规划
- 记录后端补全、前端补全、PHP停用、部署运维四个阶段实施计划
- 提供技术决策、数据库说明、进度总览等关键信息
- 更新 .gitignore 添加 *_out.txt build_output.txt 构建输出文件过滤
- 修复 utils.js 路径引用问题确保代码正常运行

module/server/koa/registry.js

@@ -3,7 +3,7 @@ import mysql from '../mysql/index.js'
 import getGameDB from '../mysql/gameDB.js'
 import * as log4js from '../log4js.js'
 import config from '../config/index.js'
-import { time, unixTime, getClientIp } from '../utils.js'
+import { time, unixTime, getClientIp } from '../utils/utils.js'
 import { readFileSync, existsSync } from 'fs'
 import { fileURLToPath } from 'url'
 import { dirname, join } from 'path'