fix(makecode): 树查询 showself 仅在 showall 时生效

避免 parent_id 懒加载把节点自身混入子级导致无限嵌套，并补充 department 回归用例与文档。

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

example/app/setup_mysql.go

@@ -83,6 +83,26 @@ func createMySQLTables(db *HoTimeDB, prefix string) {
 			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4")
 	}
 
+	// department 部门表（树形结构，供通用 CRUD 树查询测试使用；
+	// 不叫 org 是因为 config/admin.json 遗留 flow 会给 org 注入 admin_id 过滤）
+	// 注意：MakeCode 路由在 Init 时按库中已有表生成，
+	// 全新空库首次运行建表晚于 Init，/admin/department/search 需第二次运行才可用
+	tbl = prefix + "department"
+	if !mysqlTableExists(db, tbl) {
+		fmt.Println("[MySQL Setup] 创建表:", tbl)
+		db.Exec("CREATE TABLE `" + tbl + "` (" +
+			"`id` int(11) unsigned NOT NULL AUTO_INCREMENT," +
+			"`name` varchar(100) DEFAULT NULL COMMENT '部门名称'," +
+			"`parent_id` int(11) DEFAULT NULL COMMENT '父级ID'," +
+			"`parent_ids` varchar(255) DEFAULT NULL COMMENT '层级路径'," +
+			"`state` int(2) DEFAULT '0'," +
+			"`create_time` datetime DEFAULT NULL," +
+			"`modify_time` datetime DEFAULT NULL," +
+			"PRIMARY KEY (`id`)," +
+			"KEY `idx_parent_id` (`parent_id`)" +
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='部门表'")
+	}
+
 	// test_batch 测试批量表
 	tbl = prefix + "test_batch"
 	if !mysqlTableExists(db, tbl) {