BizCore v5.3 - Mundo Storefront Foundation

What this adds
- Temporary customer-facing storefront at /mundo/
- Separate Mundo storefront database setup wizard
- Secure BizCore API catalog connection
- 5-minute catalog cache/fallback
- Cart and guest checkout
- Cash on Delivery order submission to BizCore
- Local storefront order mirror for resilience
- Keeps BizCore stock as source of truth

Commission rule already supported in BizCore
1) Seller/Vendor default commission
2) Product-specific commission override
Product override has priority; otherwise seller default is used.

Install
1. Extract this ZIP into the BizCore web root.
2. Open /update-5.3.php
3. In cPanel create a NEW separate MySQL database + user for Mundo.
4. In BizCore Mundo > API Settings select the warehouse and generate an API key.
5. Open /mundo/setup.php and enter the separate DB credentials, API base and API key.
6. Open /mundo/

Notes
- v5.3 storefront foundation uses COD only. Payment gateway checkout adapters and courier live API booking/tracking are the next layer.
- Existing BizCore data is not deleted or reset.
