Enhance price set import functionality with preview options and update handling. Added new endpoints for previewing product library pulls and Excel imports, along with support for update-only imports. Updated internationalization messages for import success and error scenarios.

bms-back/sql/bms_init.sql

@@ -1305,6 +1305,8 @@ CREATE TABLE `prc_price_set_version` (
   `effective_time` datetime DEFAULT NULL COMMENT '生效时间',
   `expire_time` datetime DEFAULT NULL COMMENT '失效时间（空=长期；下一版本启动时写入该启动时间）',
   `status` char(1) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '0' COMMENT '0 draft 3 pending 1 effect 2 expired',
+  `price_build_mode` varchar(20) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '创建价格方式 PULL=拉取产品库 IMPORT=Excel导入',
+
   `created_by` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT '' COMMENT '创建人',
   `create_time` datetime DEFAULT NULL COMMENT '创建时间',
   `updated_by` varchar(64) COLLATE utf8mb4_unicode_ci DEFAULT '' COMMENT '更新人',

bms-back/sql/price/prc_price_set_version_price_build_mode_alter.sql

@@ -0,0 +1,3 @@
+-- Add create-price mode on package version: PULL / IMPORT
+ALTER TABLE prc_price_set_version
+  ADD COLUMN price_build_mode varchar(20) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '创建价格方式 PULL=拉取产品库 IMPORT=Excel导入' AFTER status;