helbreath-base-game

Add or update client/server protobuf network messages for this repo. Use when introducing new packets, changing websocket message flow, editing `multiplayer/proto/network.proto`, wiring new messages through `multiplayer/mp-client/src/utils/NetworkManager.ts`, `multiplayer/server/Server.cs`, `multiplayer/server/World/Game/GameWorld.cs`, or related server/player packet handlers.

Implement or update `multiplayer/server/**` code with performance and scalability in mind for this repo. Use when adding server-side features, changing movement or visibility logic, editing websocket receive/send flow, modifying `GameWorld` update paths, or when the user asks about server performance, hot paths, client-count scaling, or reducing avoidable allocations.