[bowencool]

Some self-hosted feed bridges can return a temporary 429 or 503 for one route, causing FreshRSS to apply a shared Retry-After cooldown to otherwise healthy feeds on the same host. Retry-After Allowlist is a system extension that lets administrators bypass that shared cooldown for selected hosts while preserving real HTTP errors and normal refresh intervals.

This adds the public extension repository to repositories.json and lists it under the existing @bowencool section in the README.

Validation:

• repositories.json parses successfully with jq
• Public metadata reports version 1.0.0 and type system
• The extension's CI passes on PHP 8.1, 8.3, and 8.5
• Integration checks pass against FreshRSS 1.30.1

[Inverle]

Would be fine as a configuration setting in the core too