BizCore v3.4.1 Purchasing Installer Compatibility Hotfix

WHY THIS HOTFIX IS NEEDED
The database query showed zero existing FOREIGN KEY constraints.
This BizCore database therefore uses a no-foreign-key table structure.
The original v3.4 migration attempted to add foreign keys and MySQL rejected
the supplier_payments table with errno 121.

INSTALL
1. Take a database and files backup.
2. Upload this ZIP to /public_html/ceylongemx.online/
3. Extract and overwrite.
4. Do not delete any existing tables or columns.
5. Open:
   https://ceylongemx.online/update-3.4.1.php
6. Click Install v3.4.1 Hotfix.
7. Press Ctrl + F5.

This installer is safe after the failed v3.4 installation. It skips database
objects that were already created and completes the remaining changes.
