fix(release): enforce AIHR tenant collation contract

backend/script/sql/aihr_candidate_material_mysql8.sql

@@ -2,7 +2,7 @@
 
 CREATE TABLE IF NOT EXISTS `aihr_candidate_material` (
   `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
-  `tenant_id` varchar(20) DEFAULT '000000' COMMENT '租户编号',
+  `tenant_id` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '000000' COMMENT '租户编号',
   `candidate_id` varchar(80) NOT NULL COMMENT '候选人外部ID',
   `candidate_name` varchar(100) DEFAULT NULL COMMENT '候选人姓名',
   `material_type` varchar(50) DEFAULT NULL COMMENT '资料类型',