Fix bound tracker traffic for VPN bypass#11
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…INDTODEVICE / IP_BOUND_IF Adds Config.BindInterface (name or numeric index). When set, the UDP listener, the UDP tracker client, and LAN multicast send sockets are pinned to that NIC via the OS-specific socket option, so outbound traffic skips the routing table. Resolution rejects loopback and down interfaces and surfaces failures as MOSS_ERR_CONFIG_INVALID — the caller never silently falls back to the VPN tunnel. NAT-PMP/PCP remains routing-table-driven for now (gateway-local). Default value is empty, behaviour unchanged when unset. Tests: ResolveBindInterface (empty / unknown / loopback / live NIC), plus a Windows-only integration test that asserts IP_UNICAST_IF is flipped on the socket after ApplyBindToUDP.
Bump 3s wait to 5s in TestRelayNodeEnforcesConfiguredBandwidth.
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Summary
Tests