The relay models the physical LAN as the gateway port, not as another remote
client. Client-originated unknown unicast now forwards only to the gateway, and
gateway-originated unknown unicast is dropped unless it resolves to a registered
remote client. Broadcast and multicast fanout is unchanged.
This prevents promiscuous gateway capture of unrelated LAN unicast from being
flooded to every remote client. It also keeps client-to-LAN traffic from
needlessly leaking to other clients in the room.
Test Plan:
- cargo fmt --check
- cargo test -p lanparty-relay
- cargo test --workspace
- cargo clippy --workspace --all-targets -- -D warnings
- git diff --check
Refs: PLAN.md
ddidderr
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