docs: remove CMS-0057-F section, link to Payerbox docs

[Nesmeshnoy]

Summary

• Removes the 9 pages under docs/solutions/CMS-0057-F/ from the Aidbox docs
• Replaces the CMS row on solutions/overview.md with a Payerbox row that links to the Payerbox docs site
• Adds 9 new redirects from the removed paths to the Payerbox docs URL; rewrites 16 existing legacy redirects (modules/compliance/payers-or-cms-0057-f/*, solutions/payers-or-cms-0057-f/*, api/other/plan-api/provider-member-match) that pointed at the now-deleted .md files — all → https://www.health-samurai.io/docs/payerbox

CMS-0057-F is the regulatory rule that Payerbox addresses as a product; it is not an Aidbox solution profile. With Payerbox docs live at https://www.health-samurai.io/docs/payerbox, the duplicate CMS-0057 section inside Aidbox docs no longer pulls its weight (low traffic), and the cleaner story for payers is "see Payerbox."

Why redirect, not just delete

docs/solutions/CMS-0057-F/* URLs still get some traffic. The site renderer (health-samurai-io-bun/src/server.ts) supports external-URL targets in redirects.yaml — they 301 to the given URL. Verified by inspecting server.ts:

if (redirectTarget.startsWith("http://") || redirectTarget.startsWith("https://")) {
  location = redirectTarget;
}

So every removed slug and every pre-existing legacy redirect now lands on the Payerbox docs root.

Test plan

• bun lint passes (verified locally: 11 checks ✓, 6 pre-existing warnings unrelated to this change)
• After merge — sample requests return 301 to https://www.health-samurai.io/docs/payerbox:
  • /docs/aidbox/solutions/CMS-0057-F
  • /docs/aidbox/solutions/CMS-0057-F/prior-authorization-support-pas-api
  • /docs/aidbox/modules/compliance/payers-or-cms-0057-f/prior-auth-api
  • /docs/aidbox/api/other/plan-api/provider-member-match
• solutions/overview renders with the new two-row table

🤖 Generated with Claude Code