docs: add husky init command to bun in setup guide

[Marukome0743]

Description

Update local setup guide to include the husky init command for v9 and clarify installation commands for lower versions.

Documentation:

• Add bunx husky init step for Husky v9 in the local-setup guide
• Clarify using bunx husky install for Husky v8 or lower versions

Motivation and Context

Follow up #4488 and #4491.

Usage examples

bun add --dev husky

# husky@v9
bunx husky init
# husky@v8 or lower
bunx husky install

# Add commit message linting to commit-msg hook
echo "bunx commitlint --edit \$1" > .husky/commit-msg
# Windows users should use ` to escape dollar signs
echo "bunx commitlint --edit `$1" > .husky/commit-msg

How Has This Been Tested?

I have tested on my local PC.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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