test: Add pytest suite for FLAMES game core logic

[Kinara2020]

📝 Description

The FLAMES game had no corresponding test file in the tests/ directory. This PR adds a comprehensive pytest suite covering core game logic including common character removal, FLAMES result calculation, score computation, and the degenerate case where both names share all letters.

9 tests added covering:

• remove_common_chars() — basic and identical name cases
• calculate_flames() — count variations (1, 3, 6)
• calculate_score() — range validation and full match
• Degenerate case detection
• Known input/output validation

🔗 Linked Issue

Closes #1243

📋 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.

[vercel]

@kinara2086 is attempting to deploy a commit to the Anuj's projects Team on Vercel.

A member of the Team first needs to authorize it.

[Kinara2020]

Reviewed

[Kinara2020]

Hello @steam-bell-92
The CI failure in modal.spec.js:4:3 is a pre-existing flaky Playwright test unrelated to this PR. It tests
Modal Lifecycle & Focus Trapping which is not affected by the pytest suite added here. 15 Playwright tests passed, and all 9 new pytest tests pass locally.

[Kinara2020]

Hello @steam-bell-92
Would like to get feedback and review upon and would request to add appropriate gssoc labels.

[github-actions]

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