Add seroski-dupbot to detect duplicate issues automatically

[sak23042006]

🚀 Pull Request Checklist

Please ensure the following before requesting a review:

• ✅ My issue is assigned to me, and I have not taken up another task simultaneously.
• 🔁 I have pulled the latest changes from the main branch.
• 🧪 My code is tested and does not break existing functionality.
• 📚 I have added/updated documentation wherever necessary.
• 🧹 My code follows the project’s coding standards.
• ✍️ My commits are clear and meaningful.
• 🧾 I have linked the issue this PR addresses with Closes #141.

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📌 Related Issue

Closes #141

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🧠 Description

This PR introduces seroski-dupbot, an AI-powered duplicate issue detection system.

The bot uses embeddings + vector search to compare new issues against existing ones, and applies a three-tier detection system:

• < 5.5 → considered unique, no action taken.
• 5.5 – 8.5 → flagged as potentially duplicate; bot comments for manual review.
• > 8.5 → automatically closed as a duplicate with a comment.

This significantly reduces noise in repositories, improves issue triage, and ensures maintainers can focus on genuine issues while avoiding clutter from duplicates.

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✅ Type of Change

• 💡 Feature

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📝 Additional Notes (Optional)

• Implemented auto-close for clear duplicates.
• Left manual review option for borderline cases to avoid false positives.
• Future scope: Extend support for multi-repo duplication checks.

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[github-actions]

🙌 Thanks @sak23042006 for raising this PR!
Our team will review it soon ⏳ — meanwhile, please make sure your PR follows our contributing guidelines 👉 Contributing Guidelines 🎉

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #157 has been merged! 🎉🎉