fix: fix sql syntax

Author: JackWang032

sql/doraemon.sql

@@ -289,5 +289,5 @@ CREATE TABLE IF NOT EXISTS `mcp_servers` (
     `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
     `updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
     PRIMARY KEY (`id`),
-    UNIQUE KEY `uk_server_id` (`server_id`),
+    UNIQUE KEY `uk_server_id` (`server_id`)
   ) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8 COLLATE = utf8_bin