Document global CPU/RAM reservations and payment options

[asib]

Reservation PR stacks

Review and merge each stack from bottom to top, then release the changes together.

• Application: ui-ex#5538 — Regional reservation pricing → ui-ex#5546 — Global reservations and unified checkout.
• Documentation: docs#2483 — Regional reservation pricing → docs#2486 — Global reservations.
• Schema prerequisite: web#4421 must deploy before ui-ex#5546. This is a cross-repository release dependency.

Stack links maintained with GPT-6.

Closes #2485

Documents the $100, $500, and $1,000 monthly CPU/RAM credit tiers, with twelve-month commitments paid upfront at 20% off or monthly at 10% off. Explains monthly expiration, scope and consumption order, first-month billing, and the dashboard purchase flow.

Stacked on #2483. Ship with superfly/ui-ex#5546 and its #5536 pricing stack after the shared-schema migration in superfly/web#4421.

Validation: checked all three table rows against the confirmed pricing formulas; git diff --check passed.

Authored with GPT-6.

[kcmartin]

Leaving this open rather than porting it, since it's still a draft. Heads up though: the docs move to Mintlify on Wednesday, so after that this branch targets a tree that no longer exists. When you pick it back up it'll need redoing as MDX against the new content, and I'm happy to help with that.

[kcmartin]

Same as #2483: this edits about/pricing.html.markerb, which was deleted at the Mintlify cutover. The page is about/pricing.mdx now.

This one is based on codex/5536-reservation-docs rather than main, so it reports mergeable, but that branch has the same problem.

Tracking the stranded PRs in superfly/docs-tracking#314.