fix : stop infinite game-over audio looping in snake game

[siri-004]

📝 Description

Fixes the issue where snake_die audio was looping or re-triggering multiple times during game over. Added a lock mechanism inside AudioManager to ensure critical sounds play only once per trigger cycle. Also introduced a reset() method to clear sound state during game restart, preventing audio persistence across sessions.

🔗 Linked Issue

Closes #749

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📋 Contribution Checklist

• My code strictly adheres to the project guidelines (Standard library only, procedural code, clean spacing).
• I have verified that my files are placed in the correct directory.
• I have tested my changes thoroughly on my local machine.
• I have included interactive emojis and clean console/UI outputs.
• GSSoC 2026: I have been formally assigned to this issue and noted it above.

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[github-actions]

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