data: add Fly.io Startup Program

[infser]

What changed

Adds one new Entity, Fly.io (entities/fl/fly-io.yaml), with the vendor-run Fly.io Startup Program: eligible early-stage companies receive up to $15,000 in platform credit plus a direct line to the Fly.io team.

Closes #1556

Sources

• https://fly.io/pricing/ (verified live HTTP 200; Startup program section states “Up to $15,000 in credit for eligible early-stage companies, plus a direct line to our team”; apply via billing@fly.io subject Startup program)

Notes

• Access is public contact via the pricing-page Startup program mailto.
• Economics encode the published up-to $15,000 credit; eligibility beyond “eligible early-stage companies” is vendor-discretion (no further thresholds published on the page).
• Distinct from Flystack (flystack.dev) open PR Add Flystack startup program #933.

[auscaster]

Thanks for this contribution. We updated the record so every fact matches the vendor's current pages and it can pass admission:

• Access instructions: Apply for credit opens an email to the Fly.io billing team with subject Startup program.
• Profile rewritten from the homepage (Fly Machines, Sprites, Managed Postgres) and homepage added as a source.
• Titles and benefit text match the pricing page; removed terms_url.

Admission re-runs automatically on this new commit.