matrix: setup livekit

Needed for element X calls.

flake.nix

@@ -123,6 +123,8 @@
           coturn = 3478;
           coturn_tls = 5349;
           ntfy = 2586;
+          livekit = 7880;
+          lk_jwt = 8081;
         };
 
         https = {
@@ -182,6 +184,10 @@
           domain = "ntfy.${https.domain}";
         };
 
+        livekit = {
+          domain = "livekit.${https.domain}";
+        };
+
         syncthing = {
           dataDir = services_dir + "/syncthing";
           signalBackupDir = "/${zpool_ssds}/bak/signal";