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* fix(grpc): require host match before routing dials to local Unix socket (#9254) resolveLocalGrpcSocket keyed the Unix-socket hijack on port alone, so a remote peer reusing a local gRPC port (e.g. a standalone `weed volume` defaulting port.grpc=17334 against a `weed server` whose in-process volume socket is also on 17334) had its inbound RPCs silently rerouted to the local socket. In a cross-DC replication=100 cluster this surfaced as persistent volume-grow failure: both AllocateVolume RPCs landed on the local volume server, the second returned "Volume Id N already exists!", the grow rolled back, and S3 PUTs to the new collection returned 500. Track a per-port set of host strings that count as "this machine" and require the dial host to be in that set before redirecting. Loopback aliases (localhost, 127.0.0.1, ::1, "") are always included so same-process dials via loopback still take the socket fast path. * test(grpc): cover empty-host bare-port dial in local-socket regression test The empty alias is registered explicitly so SplitHostPort outputs like ":17334" (which can occur when a caller dials a bare port) take the local-socket fast path. Add a case so that path is exercised.