fix(pricing): set Pro to $39 and focus Cloud pricing on four plans

[Hydralerne]

Summary

Sets new Openship Pro subscriptions to $39/month and puts Hobby, Starter, Pro, and Scale at the top of /pricing. The previous layout included a Free Cloud card, pushed paid plans far down the page, and wrapped Scale onto a second row on desktop.

Changes

• The shared catalog supplies prices, credits, and resource limits to checkout, the dashboard, and the website. Pro keeps its 3,500-credit allowance and resources. New checkouts use v5 offer references; existing v1–v4 subscriptions retain their purchased terms, including $40 Pro subscriptions. Top-up offers are unchanged.
• The marketing page shows four paid cards with aligned prices, buttons, and resource rows. It uses the existing theme tokens, a subtle Pro highlight, and responsive four-, two-, and one-column layouts. Enterprise and self-hosting remain secondary options; shared benefits appear once below the cards.
• The website validates the public catalog with the existing billing contract. Pricing FAQs and search metadata match the paid offers, explain metered usage, and omit prices when the catalog is unavailable. Obsolete pricing styles and the duplicated catalog schema are removed.
• Pricing documentation and the illustrative cost calculation reflect $39 Pro.

Related issue

None. Requested pricing update following #1028.

Verification

Core pricing: 95 tests passed
API billing and SDK/HTTP parity: 268 tests passed
Dashboard billing: 77 tests passed
Core, API, and website typechecks passed
Public SDK/CLI build passed
Documentation: 164 pages compiled; 120 SDK examples type-checked
Website production build: 555 static pages generated
Changed website TypeScript files: Prettier check passed

Chromium checks used the actual engine catalog at widths 320, 390, 620, 820, 1024, 1100, 1280, and 1440. All four paid plans and their prices/credits match the catalog; buttons align within each row and no card content or page overflows. Keyboard FAQ interaction and plan links passed, with no browser errors. A simulated catalog outage shows the dashboard fallback without invented prices or structured offers, and the four cards return on recovery.

At 1440px, the first cards now begin around 419px down the page instead of 1640px, and all four fit on one row. Styles outside the pricing section are unchanged.

The billing regression checks preserve a saved $40 v4 purchase while new Pro checkout uses $39, and retain explicit service-ceiling validation for v4 and v5 contracts. No live customer billing was changed.