fix: 代理迁移脚本补充 ConcurrencyStamp，避免 MySQL 1674

Co-authored-by: Cursor <cursoragent@cursor.com>

sql/migrate_agent_module_20261029.sql

@@ -1,5 +1,6 @@
 -- 渠道代理与返佣（首版轻量）。可重复执行。
 -- 含：t_agent、t_agent_commission_detail；t_customer / t_order 扩展 AgentId。
+-- AggregateRoot 需要 ConcurrencyStamp。
 
 SET @db := DATABASE();
 
@@ -22,11 +23,25 @@ CREATE TABLE IF NOT EXISTS `t_agent` (
   `CreateTime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `UpdateUserId` INT NOT NULL DEFAULT 0,
   `UpdateTime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  -- 不用 DEFAULT(UUID())：statement 复制下会报 1674；运行时由 ORM 写入
+  `ConcurrencyStamp` CHAR(36) NOT NULL DEFAULT '' COMMENT '并发戳',
   PRIMARY KEY (`Id`),
   KEY `ix_agent_code` (`AgentCode`),
   KEY `ix_agent_userid` (`UserId`)
 ) COMMENT='渠道代理主数据';
 
+-- 已建表补 ConcurrencyStamp（可重复）
+SET @exists := (
+  SELECT COUNT(1) FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 't_agent' AND COLUMN_NAME = 'ConcurrencyStamp'
+);
+SET @sql := IF(
+  @exists = 0,
+  'ALTER TABLE `t_agent` ADD COLUMN `ConcurrencyStamp` CHAR(36) NOT NULL DEFAULT '''' COMMENT ''并发戳'' AFTER `UpdateTime`',
+  'SELECT ''t_agent.ConcurrencyStamp already exists'' AS info'
+);
+PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;
+
 -- ---------- t_agent_commission_detail ----------
 CREATE TABLE IF NOT EXISTS `t_agent_commission_detail` (
   `Id` INT NOT NULL AUTO_INCREMENT,
@@ -47,12 +62,24 @@ CREATE TABLE IF NOT EXISTS `t_agent_commission_detail` (
   `CreateTime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `UpdateUserId` INT NOT NULL DEFAULT 0,
   `UpdateTime` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `ConcurrencyStamp` CHAR(36) NOT NULL DEFAULT '' COMMENT '并发戳',
   PRIMARY KEY (`Id`),
   KEY `ix_agent_comm_agent` (`AgentId`),
   KEY `ix_agent_comm_order` (`OrderId`),
   KEY `ix_agent_comm_status` (`Status`)
 ) COMMENT='代理返佣明细（首版无余额入账）';
 
+SET @exists := (
+  SELECT COUNT(1) FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 't_agent_commission_detail' AND COLUMN_NAME = 'ConcurrencyStamp'
+);
+SET @sql := IF(
+  @exists = 0,
+  'ALTER TABLE `t_agent_commission_detail` ADD COLUMN `ConcurrencyStamp` CHAR(36) NOT NULL DEFAULT '''' COMMENT ''并发戳'' AFTER `UpdateTime`',
+  'SELECT ''t_agent_commission_detail.ConcurrencyStamp already exists'' AS info'
+);
+PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;
+
 -- ---------- t_customer.AgentId ----------
 SET @exists := (
   SELECT COUNT(1) FROM information_schema.COLUMNS