feat: migrate ERP configuration from .env to per-user database storage

- Moved ERP credentials (URL, username, password) from environment variables to dbo_BIPUsers table
- Each user now has their own ERP configuration stored in the database
- Added UserErpConfigService for managing per-user ERP settings
- Updated cleaner and extractor handlers to fetch ERP config from database instead of .env
- Removed ERP fields from ConfigManager UI editable fields
- Added new IPC handlers and preload APIs for user ERP config management
- Includes migration script to transfer existing .env ERP settings to database
- Added migration guide documentation

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/main/services/user/migration/manual-migration.sql

@@ -0,0 +1,98 @@
+-- ============================================
+-- BIPUsers 表迁移：添加 ERP 参数字段
+-- 数据库：MySQL
+-- 目标数据库：BLD_DB
+-- ============================================
+-- 使用说明：
+-- 1. 在 MySQL Workbench / Navicat / DBeaver 中打开此文件
+-- 2. 连接到数据库 192.168.31.83:3306/BLD_DB
+-- 3. 执行全部 SQL 语句
+-- ============================================
+
+-- 切换到目标数据库
+USE BLD_DB;
+
+-- ============================================
+-- 步骤 1: 添加新字段
+-- ============================================
+
+-- 添加 ERP_URL 字段（如果不存在）
+-- 注意：如果 MySQL 版本不支持 ADD COLUMN IF NOT EXISTS，请移除 IF NOT EXISTS
+ALTER TABLE dbo_BIPUsers 
+ADD COLUMN ERP_URL VARCHAR(500) NULL COMMENT 'ERP 系统 URL';
+
+-- 添加 ERP_Username 字段
+ALTER TABLE dbo_BIPUsers 
+ADD COLUMN ERP_Username VARCHAR(255) NULL COMMENT 'ERP 用户名';
+
+-- 添加 ERP_Password 字段
+ALTER TABLE dbo_BIPUsers 
+ADD COLUMN ERP_Password VARCHAR(255) NULL COMMENT 'ERP 密码';
+
+-- ============================================
+-- 步骤 2: 验证字段已添加
+-- ============================================
+
+-- 显示表结构，确认新字段已添加
+SELECT '字段添加验证' AS step;
+DESCRIBE dbo_BIPUsers;
+
+-- 或者使用以下查询确认新字段
+SELECT 
+  COLUMN_NAME AS '字段名',
+  DATA_TYPE AS '数据类型',
+  CHARACTER_MAXIMUM_LENGTH AS '最大长度',
+  IS_NULLABLE AS '允许 NULL',
+  COLUMN_COMMENT AS '注释'
+FROM INFORMATION_SCHEMA.COLUMNS
+WHERE TABLE_SCHEMA = 'BLD_DB'
+  AND TABLE_NAME = 'dbo_BIPUsers'
+  AND COLUMN_NAME IN ('ERP_URL', 'ERP_Username', 'ERP_Password')
+ORDER BY COLUMN_NAME;
+
+-- ============================================
+-- 步骤 3: 初始化 ERP 配置
+-- 注意：请根据实际情况修改下面的配置值！
+-- ============================================
+
+SELECT '=== 请修改下面的 ERP 配置值 ===' AS notice;
+SELECT '当前数据库中的用户:' AS notice;
+SELECT UserName, UserType, ComputerName FROM dbo_BIPUsers ORDER BY UserName;
+
+-- 更新所有用户的 ERP 配置
+-- ⚠️ 请修改下面的配置值为你实际的 ERP 凭证！
+UPDATE dbo_BIPUsers 
+SET 
+  ERP_URL = 'https://68.11.34.30:8082/',        -- 修改为你的 ERP 系统 URL
+  ERP_Username = 'your_erp_username',            -- 修改为你的 ERP 用户名
+  ERP_Password = 'your_erp_password'             -- 修改为你的 ERP 密码
+WHERE ERP_URL IS NULL OR ERP_URL = '';
+
+-- 显示更新后的结果
+SELECT 
+  '更新后的 ERP 配置' AS notice,
+  UserName,
+  ERP_URL,
+  ERP_Username
+FROM dbo_BIPUsers
+ORDER BY UserName;
+
+-- ============================================
+-- 步骤 4: 完成确认
+-- ============================================
+
+SELECT '================================' AS '';
+SELECT '迁移完成！' AS message;
+SELECT '================================' AS '';
+SELECT '请确认：' AS notice;
+SELECT '1. 所有用户都有 ERP_URL 配置' AS check1;
+SELECT '2. ERP_URL 格式正确' AS check2;
+SELECT '3. ERP 用户名和密码正确' AS check3;
+SELECT '================================' AS '';
+
+-- 统计信息
+SELECT 
+  COUNT(*) AS total_users,
+  COUNT(ERP_URL) AS users_with_erp_url,
+  COUNT(ERP_Username) AS users_with_erp_username
+FROM dbo_BIPUsers;