fix(fleet): align customer identity collation for fulfillment joins

lastleg-service/src/main/resources/db/lastleg.sql

@@ -1175,7 +1175,7 @@ CREATE TABLE ll_fleet_external_booking (
   booking_no VARCHAR(32) NOT NULL COMMENT '外接预订业务编号',
   trip_id BIGINT NOT NULL COMMENT '所属车次',
   trip_no VARCHAR(32) NOT NULL COMMENT '车次业务编号',
-  customer_id VARCHAR(128) NOT NULL COMMENT '委托客户及付款归属',
+  customer_id VARCHAR(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '委托客户及付款归属',
   customer_code VARCHAR(64) NOT NULL COMMENT '客户编号快照',
   customer_name VARCHAR(255) NOT NULL COMMENT '客户名称快照',
   status VARCHAR(16) NOT NULL COMMENT 'DRAFT询价/CONFIRMED占位/RECEIVED确认实收/BOUND关联发运/CANCELLED取消',
@@ -1228,7 +1228,7 @@ CREATE TABLE ll_fleet_pool_order_link (
   id BIGINT NOT NULL COMMENT '内部主键',
   booking_id BIGINT NOT NULL COMMENT '唯一外接预订',
   booking_no VARCHAR(64) NOT NULL COMMENT '预订业务编号',
-  customer_id VARCHAR(128) NOT NULL COMMENT '商业客户隔离范围',
+  customer_id VARCHAR(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '商业客户隔离范围',
   business_type VARCHAR(32) NOT NULL COMMENT '本土散板或本土卡车商业类型',
   business_order_id BIGINT NOT NULL COMMENT '对应商业订单内部关联',
   business_order_no VARCHAR(64) NOT NULL COMMENT '本土商业订单业务编号',