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e7718b0423
The subscription fetch guard (fetchGuard.ts) unconditionally blocked all
loopback/private IP ranges as SSRF protection, but the same feature already
permits loopback for the routing half (coreEndpoint.ts's
ALLOWED_LOCAL_CORE_HOSTS) — so an operator could route traffic through a
loopback core but could not fetch a proxy list from a loopback HTTP server.
Make the fetch guard local-first by reusing the existing
areLocalProviderUrlsAllowed() policy (default ON) from
outboundUrlGuardPolicy.ts: loopback/private hosts are now allowed as fetch
targets by default, while cloud-metadata/link-local (169.254.0.0/16, incl.
169.254.169.254 IMDS) and the unspecified address stay blocked
unconditionally, mirroring the provider-validation guard's "block-metadata"
mode. Callers that want the old strict behavior can pass
{ allowLocal: false }.
Closes #10158.