docs: add pre-commit install guide on CONTRIBUTING.md

[dingo4dev]

Summary

CONTRIBUTING.md

• Added instructions for setting up pre-commit hooks using the uv tool install pre-commit
• Added an optional step to run pre-commit hooks on all files using the pre-commit run --all-files command.

Motivation and Context

To enhance the development setup and workflow instructions. The changes include adding steps for setting up and running pre-commit hooks.

Types of changes

• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[Copilot]

Pull Request Overview

Adds documentation steps for setting up and running pre-commit hooks in the CONTRIBUTING guide

• Introduces a new step for installing pre-commit via the uv tool
• Adds an optional step to run all pre-commit hooks across the codebase

Comments suppressed due to low confidence (1)

CONTRIBUTING.md:54

• [nitpick] The list numbering is now duplicated because of the inserted steps. Consider updating this to '8.' or using Markdown's auto-numbering (all '1.') to keep the sequence correct without manual renumbering.

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