Ballbox deep rebrand extras

Integrated into machine copy now:
- F1-pay-banner -> ImagePay/46d3a954-ec76-4f45-8696-e153b4ef48be.png
- G1-side-poster -> ImageRight/a2f1d5b7-2291-4fa5-8fa3-1385218008a4.png
- D1-how-to-buy -> ImageScreen/流程图.jpg
- E1-brand-placeholder -> pollFile/Screeempty.png
- H1-ad-slot-default -> pollFile/adEmpty.png

Included as extra assets for next UI/skin pass:
- A2-home-secondary.png
- B1-selection-screen.png
- C1-payment-qr.png

Notes:
- The machine dump exposed exact paths for the 5 integrated assets above.
- A2/B1/C1 did not have a confirmed exact file path in this dump, so they are bundled as extras, not forced into unknown slots.
