docs(deploy): record current production runtime

[JasonTM17]

Summary

• document the current Railway d2024a8 API/worker rollout and immutable digest
• record the unchanged Vercel 977d55f web revision and free-plan quota boundary
• add exact health, CI, and rollback evidence

Verification

• docs validator: 745 internal links and 148 config keys verified
• no code, schema, or secret changes

[vercel]

Deployment failed with the following error:

Resource is limited - try again in 24 hours (more than 100, code: "api-deployments-free-per-day").

Learn More: https://vercel.com/nguyensonbmt06-6377s-projects?upgradeToPro=build-rate-limit