fix(firstleg): use short cabinet pallet identities

firstleg/src/main/resources/db/phase3-smart-loading-schema.sql

@@ -27,7 +27,7 @@ CALL phase3_add_allocation_picked_count();
 DROP PROCEDURE phase3_add_allocation_picked_count;
 
 CREATE TABLE IF NOT EXISTS fl_document_sequence (
-  sequence_key VARCHAR(32) NOT NULL COMMENT '单据类型与北京时间日期组合键，例如CAB:20260818',
+  sequence_key VARCHAR(32) NOT NULL COMMENT '单据序列键；日序列如CB:20260818，柜次长期序列固定为CABINET',
   current_value INT UNSIGNED NOT NULL COMMENT '该类型当日已分配的最大序号',
   PRIMARY KEY (sequence_key),
   CONSTRAINT chk_fl_document_sequence_value CHECK (current_value > 0)
@@ -388,7 +388,7 @@ CREATE TABLE IF NOT EXISTS fl_loading_pallet_label (
   destination_warehouse_code VARCHAR(64) NOT NULL COMMENT 'FBA仓编码快照',
   destination_warehouse_name VARCHAR(128) NULL COMMENT 'FBA仓名称快照',
   pallet_index INT UNSIGNED NOT NULL COMMENT '当前柜当前FBA仓内从1开始的序号',
-  pallet_code VARCHAR(128) NOT NULL COMMENT '托盘码：集装箱号-FBA仓编码-三位序号',
+  pallet_code VARCHAR(128) NOT NULL COMMENT '托盘码：平台柜次号-FBA仓内部编号-三位序号；不依赖可跨提单复用的真实柜号',
   created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '生成时间',
   PRIMARY KEY (id),
   UNIQUE KEY uk_loading_pallet_code (pallet_code),