Improve the paid audit conversion path

[SpaleRuby]

What changed

• places the $10 ProofDesk Launch QA upgrade directly below the product screenshot
• links both the verified scope and the GitHub order form
• refreshes the terminal demo and PNG to match the current live check: 0 blocker/high/medium, 2 low, 16 passed
• removes the stale Missing og:image claim after that metadata was fixed

Validation

• npm test — 5/5 passing
• git diff --check
• fresh production run against https://spaleruby.github.io/proofdesk-orders/
• rendered docs/terminal-demo.html at 960×540 and visually inspected the PNG

OpenAI Codex assisted with the conversion audit, implementation, validation, and PR text.