fix(stats/self_input): 唯一索引含 delete_time，软删后可重新录入

去掉「同日+同渠道」全局唯一，回到按录入人判重；唯一索引补 delete_time 避免软删占键导致 1062；错误提示带冲突记录 ID，迁移脚本兼容多次执行。

Co-authored-by: Cursor <cursoragent@cursor.com>

server/sql/1.9.20260521/create_personal_yeji_table.sql

@@ -20,7 +20,7 @@ CREATE TABLE IF NOT EXISTS `zyt_personal_yeji` (
   `update_time` int(11) unsigned NOT NULL DEFAULT '0' COMMENT '更新时间',
   `delete_time` int(11) unsigned DEFAULT NULL COMMENT '删除时间',
   PRIMARY KEY (`id`),
-  UNIQUE KEY `uk_creator_date_media` (`creator_id`, `yeji_date`, `media_source`),
+  UNIQUE KEY `uk_creator_date_media` (`creator_id`, `yeji_date`, `media_source`, `delete_time`),
   KEY `idx_yeji_date` (`yeji_date`),
   KEY `idx_creator_id` (`creator_id`),
   KEY `idx_dept_id` (`dept_id`)