Add remote database host and update migration SQL

- Added a new remote host configuration to config.php for database connection.
- Updated migration script to ensure proper addition of 'min_order_amount' column in pp_shop_payment_methods table.
- Created .gitignore file to exclude cache directory.
- Added project configuration file for Serena with initial settings and tool configurations.

config.php

@@ -1,5 +1,6 @@
 <?php
 $database['host']               = 'localhost';
+$database['remote_host'] = 'host700513.hostido.net.pl';
 $database['user']               = 'host117523_shoppro';
 $database['password']           = 'mhA9WCEXEnRfTtbN33hL';
 $database['name']               = 'host117523_shoppro';