fix: add gevent dependency instead of pre-fork

[Prajna1999]

Summary

Target issue is #PLEASE_TYPE_ISSUE_NUMBER
Explain the motivation for making this change. What existing problem does the pull request solve?

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Please add here if any other information is required for the reviewer.

Summary by CodeRabbit

• Chores
  • Updated backend dependencies to enhance stability and performance.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

A single dependency addition to the backend Python project, introducing gevent>=25.9.1 into the project's dependency manifest file.

Changes

Cohort / File(s)	Summary
Dependency Management backend/pyproject.toml	Added gevent>=25.9.1 as a project dependency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A hop, a skip, the deps expand,
Gevent joins with steady hand,
Version twenty-five takes the stage,
New concurrency blooms on the page! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: add gevent dependency instead of pre-fork' directly reflects the main change: adding gevent as a dependency to replace pre-fork handling.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/gevent

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