Add Windows keyboard state fallback for play mode

[Adarsh-9182]

Summary

• Add a Windows-only fallback using GetAsyncKeyState for configured action keys.
• Keep the existing Pygame event/key-state path unchanged for all platforms.
• Use the fallback only when Pygame reports no mapped action.

Context

This targets the manual-control issue reported in #47, where the Pygame window renders but does not receive keyboard input on a Windows setup.

Verification

• python3 -m py_compile src/game/game.py
• git diff --check

I could not reproduce the Windows-specific input issue locally from this macOS environment.

Refs #47