docs & feat: add license & attribution notice (Apache-2.0 / GPL-3.0) and core system enhancements

internal/gameserver/handlers_player.go

@@ -179,6 +179,8 @@ const heartbeatLua = `local function beta_text()
     end
 end
 beta_text()
+
+
 `
 
 func luaQuotedString(value string) string {