[None][docs] use requirements-dev.txt for dev environment setup in CONTRIBUTING.md

[fuergaosi233]

Summary

• CONTRIBUTING.md instructed contributors to run pip install pre-commit mypy without a version pin
• requirements-dev.txt pins mypy==1.19.1 along with other required dev tools (typeguard, ruff, bandit, etc.)
• Using an unpinned mypy install could result in a different mypy version than CI uses, causing type check failures that are hard to reproduce locally

Changes

Replace the ad-hoc install command with pip install -r requirements-dev.txt to ensure contributors use the same tool versions as CI.

Test plan

• Verify pip install -r requirements-dev.txt && pre-commit install sets up a working dev environment
• Verify mypy --version reports 1.19.1 after installation

Summary by CodeRabbit

• Documentation
  • Updated local development setup instructions to install development dependencies via a requirements file instead of individual package installation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between c5b0372 and e8fb6a0.

📒 Files selected for processing (1)

• CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

CONTRIBUTING.md is updated to streamline the local development setup instructions. The pre-commit installation step now references the requirements-dev.txt file instead of individually specifying pre-commit and mypy packages, consolidating dependency management into a single file.

Changes

Development Setup Documentation

Layer / File(s)	Summary
Pre-commit setup instructions CONTRIBUTING.md	The local setup section for pre-commit is updated to use pip install -r requirements-dev.txt instead of pip install pre-commit mypy, centralizing development dependency installation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: updating CONTRIBUTING.md to use requirements-dev.txt for development environment setup instead of ad-hoc pip installs.
Description check	✅ Passed	The PR description adequately explains the issue (unpinned mypy versions causing CI mismatches), the solution (using requirements-dev.txt), and includes a test plan, though it deviates from the template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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