Fix: Multipart upload lock management

Summary

This PR fixes critical lock management issues in the object storage layer, specifically addressing:

1. Read lock lifecycle management during object reads
2. Missing write lock protection in multipart upload completion
3. Lock manager initialization to ensure proper sharing across SetDisks instances

Type of Change

• New Feature
• Bug Fix
• Documentation
• Performance Improvement
• Test/CI
• Refactor
• Other:

Related Issues

#827

Summary of Changes

Checklist

• I have read and followed the CONTRIBUTING.md guidelines
• Passed make pre-commit
• Added/updated necessary tests
• Documentation updated (if needed)
• CI/CD passed (if applicable)

Impact

• Breaking change (compatibility)
• Requires doc/config/deployment update
• Other impact:

Additional Notes

Thank you for your contribution! Please ensure your PR follows the community standards (CODE_OF_CONDUCT.md) and sign the CLA if this is your first contribution.