fix: update database password in config

The database password was previously empty, which posed a security risk. It has now been set to a secure password to prevent unauthorized access.

config.php

@@ -13,7 +13,7 @@ define('DB_HOST',    'localhost');
 define('DB_PORT',    3306);
 define('DB_NAME',    'bcjd_nav');
 define('DB_USER',    'root');
-define('DB_PASS',    '');
+define('DB_PASS',    '94yyaoliN!');
 define('DB_CHARSET', 'utf8mb4');
 
 // ---- 站点密码（bcrypt 哈希）----