Игровая логика PvP: сервер (C++) + клиент (Quintus.js)

Сервер: Game — authoritative-тик 20 Гц через uSockets timer, движение/коллизии
танков и пуль, разрушаемые кирпичные стены, respawn, победа/поражение/ничья,
технический проигрыш при дисконнекте. game.ready запускает матч, когда оба
игрока в pvp-комнате готовы.

Клиент: заведён Quintus.js (MIT, vendored) — Tank/Bullet/Wall спрайты,
рендер по снапшотам game.state, keyboard-инпут (WASD/стрелки/space),
экран результата матча.

Найден и исправлен use-after-free: колбэк onFinished_ синхронно удалял
Game изнутри его же метода — перенесено на uWS::Loop::defer.

frontend/vendor/quintus/LICENSE.txt

@@ -0,0 +1,20 @@
+Copyright (c) 2011 Cykod LLC, http://coderdeck.com/
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.