Set up an authoritative matchmaker and realtime match handler using Nakama

Steps

1. From the client SDK, call the matchmaker add method (e.g. AddMatchmakerAsync or add_matchmaker_async depending on SDK language) with minCount, maxCount, and a Lucene-like query plus string/numeric properties describing the player
2. On the server, register a before-hook with nk.register_rt_before(fn, "MatchmakerAdd") to authoritatively override or validate cheat-prone properties like rank instead of trusting client-supplied values
3. Set count_multiple so it evenly divides your desired match size, since matchmaker tickets never resolve if the pool can't be split evenly
4. Implement the authoritative match handler server-side (Go, Lua, or TypeScript runtime) using MatchInit and the related match loop callbacks to run per-tick game logic
5. Test matchmaking queries carefully in staging — a leftover wildcard query like "*" will match any opponent regardless of intended properties
6. Deploy the server runtime module alongside the Nakama server and verify match creation end-to-end before opening matchmaking to real players