feat: support overseas warehouse locations and A0 overflow

deploy/sql/migrations/overseas/baiyue_lastlag_warehouse/V1__add_shared_overflow_location.sql

@@ -0,0 +1,5 @@
+-- 海外仓库位 A0 共享溢出位：普通库位独占，A0 允许多托盘共享。
+ALTER TABLE wh_location
+  ADD COLUMN shared_overflow TINYINT(1) NOT NULL DEFAULT 0
+  COMMENT '是否系统共享溢出库位（A0）'
+  AFTER location_type;

deploy/sql/海外区域统一增量-MySQL8.sql

@@ -2920,6 +2920,7 @@ CREATE TABLE wh_location (
   zone_code varchar(50) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '仓库分区编码',
   location_code varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '仓库内唯一库位编码',
   location_type varchar(32) COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '库位类型',
+  shared_overflow tinyint(1) NOT NULL DEFAULT '0' COMMENT '是否系统共享溢出库位（A0）',
   max_load_kg decimal(18,3) NOT NULL COMMENT '最大承重（千克）',
   status varchar(20) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'ACTIVE' COMMENT '库位状态：ACTIVE启用、INACTIVE停用',
   remark varchar(500) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '备注',