클래식 pygame GUI 이식

맥락:
- classic 게임을 사람이 플레이할 수 있도록 레거시 pygame GUI를 가져온다.
- 현재 GUI는 Python backend와 registry bot만 지원하고 Rust backend와 학습 checkpoint 로딩은 제외한다.

변경:
- pygame_pvp.py를 classic 패키지에 이식하고 tier, backend 선택, Deep CFR checkpoint 옵션을 제거했다.
- lost-cities-classic-gui 엔트리포인트와 README 실행 안내를 추가했다.
- GUI argparse smoke 테스트를 추가했다.

확인:
- uv run pre-commit run --all-files
- uv run pytest tests/games/classic
- uv run lost-cities-classic-gui --help
- SDL_VIDEODRIVER=dummy SDL_AUDIODRIVER=dummy uv run python - <<'PY'
from coolrl_lost_cities.games.classic.pygame_pvp import LostCitiesGuiApp
app = LostCitiesGuiApp(mode='pvc', bot_name='random', seed=1, width=1024, height=768)
app.draw()
app.pygame.quit()
print('gui init ok')
PY

README.md

@@ -27,6 +27,15 @@ For future GUI work, install the optional GUI dependencies:
 uv sync --extra gui
 ```
 
+Run the classic pygame GUI:
+
+```bash
+uv run lost-cities-classic-gui --mode pvc --bot safe-heuristic
+```
+
+The GUI currently uses the Python backend only. The Rust core remains covered by
+parity tests and is not exposed as a GUI backend.
+
 ## Basic Usage
 
 ```python