fix: make pygame dependency optional in Snake Game (#635)

[dhruvpatel16120]

📝 Description

This PR resolves Issue #635 by making the pygame dependency optional in the Snake Game project.

Previously, the game crashed on systems where pygame was not installed due to direct imports for sound handling:
ModuleNotFoundError: No module named 'pygame'

Changes Made

• Wrapped pygame imports inside try-except ImportError blocks.
• Added fallback execution when pygame is unavailable.
• Disabled sound effects gracefully instead of terminating the game.
• Added informative console warnings to guide users for optional pygame installation.
• Preserved compatibility with the repository’s lightweight and zero-dependency-friendly structure.

This improves usability and allows the game to run successfully on fresh Python setups without requiring additional packages.

🔗 Linked Issue

Closes #635

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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 Issue 🐛 fix(snake): make pygame import optional to prevent startup crash #635 and noted it above.

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[dhruvpatel16120]

hello @steam-bell-92,please check the PR merge it if everything is perfect or let me know if any changes i have to made in !

[dhruvpatel16120]

if you have time then please approve my issue : #636 and #637 under gssoc !