feat(imLoginFailureLog): 用户登录密码错误次数锁定与解锁能力（管理端）

- 安全策略登录限频由 JSON 文本改为结构化表单（次数/锁定分钟/窗口分钟），编辑校验同步扩展
- 失败日志新增解锁入口：/imLoginFailureLog/unlock 经 internal 通道调用 im-server 释放锁定
- 失败日志模型补充 accountHash 字段，解锁按钮按 risk_action=account_locked 展示
- 租户业务库初始化模板补充 im_login_lockouts 等表；新增解锁按钮菜单权限 SQL

docs/admin-adfahi-research/sql/IM-租户业务库初始化.sql

@@ -947,6 +947,22 @@ CREATE TABLE IF NOT EXISTS `im_login_failure_logs` (
   KEY `idx_im_login_failure_request` (`request_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
 
+CREATE TABLE IF NOT EXISTS `im_login_lockouts` (
+  `id` bigint NOT NULL,
+  `user_id` bigint DEFAULT NULL,
+  `account_hash` char(64) NOT NULL,
+  `failed_attempts` int NOT NULL DEFAULT '0',
+  `window_started_at` datetime(3) DEFAULT NULL,
+  `locked_until` datetime(3) DEFAULT NULL,
+  `last_attempt_at` datetime(3) DEFAULT NULL,
+  `created_at` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  `updated_at` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uk_im_login_lockouts_account` (`account_hash`),
+  KEY `idx_im_login_lockouts_user` (`user_id`),
+  KEY `idx_im_login_lockouts_locked` (`locked_until`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+
 CREATE TABLE IF NOT EXISTS `im_mailbox_config` (
   `id` bigint NOT NULL AUTO_INCREMENT,
   `enabled` tinyint NOT NULL DEFAULT '1',