Feat/configurable GitHub query limits

[ShashwatUpadhayay]

Summary

• Make GitHub query limits configurable through environment variables:
  • GITHUB_REPO_COUNT
  • GITHUB_PR_COUNT
  • GITHUB_ISSUE_COUNT
  • GITHUB_DISCUSSION_COUNT
• Add parsing and validation with sensible defaults and upper bounds
• Replace hardcoded query limits with runtime configuration
• Document the new environment variables
• Add unit tests for parsing and validation logic

Testing

• Verified default values are used when environment variables are missing or invalid
• Verified valid values are parsed correctly
• Verified oversized values are clamped to the configured maximum
• Ran the test suite successfully

[vercel]

@ShashwatUpadhayay is attempting to deploy a commit to the osama's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Thank you for the pull request! ✅

A maintainer will review this soon. Please be patient while we take a look. 🙌

[ShashwatUpadhayay]

Hello.. Please merge this PR if it is all good... Please notify in case of any errors

[O2sa]

You should do your new edits in the top of the latest changes of the main branch and to do that go to the main branch and pull the latest changes and then create your new branch from the main...

[ShashwatUpadhayay]

My Apologies!.. Issuing a new PR with the above fixes
Thanks!.

[ShashwatUpadhayay]

Close #160