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* Fail closed on delegated fetch backends to close SSRF gap * fix(community): resolve delegated-fetch credentials from one config snapshot Address review feedback on the fail-closed SSRF guard: - firecrawl/fastcrw client construction no longer re-reads get_app_config(), so the API key and endpoint come from the same revision the endpoint screen validated (prevents cross-revision credential misrouting). - fix the browserless test double to accept the new two-argument _get_browserless_client signature. - document the check-only (DNS rebinding) caveat on validate_delegated_backend_url. - add a CHANGELOG upgrade note for the default self-hosted backend break. * fix(doctor): consolidate delegated fetch backend checks and deployment guidance --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>