BizCore v6.4.2 - Mundo Dedicated Platform Workspace

SAFE PATCH
- Creates one dedicated business unit: Mundo Marketplace (code MUNDO) under the current parent company.
- Detects the channel used by the live Mundo storefront API key and assigns that control channel to the Mundo workspace.
- Seller Applications / Vendor marketplace administration resolves to the Mundo platform workspace, regardless of which operating workspace was selected before opening the page.
- Elixora, Infinite Cashew and future operating workspaces remain independent product/inventory sources.
- Existing products, stock, seller applications, vendors, orders and finance records are not deleted/reset.

Install:
1. Upload/extract this ZIP over the BizCore domain root.
2. Login as Super Admin and open /update-6.4.2.php
3. Confirm the green success message.
4. Open Workspaces and confirm "Mundo Marketplace" exists.
5. Open Seller Applications and continue approval testing.
