feat: 重构BOM架构，新增基础设置与虚拟工位管理功能

本次重构删除原有BOM物料清单表，改用工单工艺组合×工艺物料清单作为唯一用料来源；新增系统基础设置表支持WMS地址、日志保留天数等配置，新增虚拟工位作业管理后台接口与前端页签控制功能，同时优化工位号校验逻辑、事件日志自动清理与工单用料查询能力。

bj_power_mes/ent/ent.go

@@ -7,7 +7,6 @@ import (
 	"bj_power_mes/ent/alertrule"
 	"bj_power_mes/ent/associationtrace"
 	"bj_power_mes/ent/attachment"
-	"bj_power_mes/ent/bomitem"
 	"bj_power_mes/ent/dailyplan"
 	"bj_power_mes/ent/dock"
 	"bj_power_mes/ent/eventlog"
@@ -27,6 +26,7 @@ import (
 	"bj_power_mes/ent/stationstate"
 	"bj_power_mes/ent/stepcriterion"
 	"bj_power_mes/ent/stepdata"
+	"bj_power_mes/ent/sysconfig"
 	"bj_power_mes/ent/torqueauditlog"
 	"bj_power_mes/ent/torquerecord"
 	"bj_power_mes/ent/user"
@@ -108,7 +108,6 @@ func checkColumn(t, c string) error {
 			alertrule.Table:         alertrule.ValidColumn,
 			associationtrace.Table:  associationtrace.ValidColumn,
 			attachment.Table:        attachment.ValidColumn,
-			bomitem.Table:           bomitem.ValidColumn,
 			dailyplan.Table:         dailyplan.ValidColumn,
 			dock.Table:              dock.ValidColumn,
 			eventlog.Table:          eventlog.ValidColumn,
@@ -128,6 +127,7 @@ func checkColumn(t, c string) error {
 			stationstate.Table:      stationstate.ValidColumn,
 			stepcriterion.Table:     stepcriterion.ValidColumn,
 			stepdata.Table:          stepdata.ValidColumn,
+			sysconfig.Table:         sysconfig.ValidColumn,
 			torqueauditlog.Table:    torqueauditlog.ValidColumn,
 			torquerecord.Table:      torquerecord.ValidColumn,
 			user.Table:              user.ValidColumn,