Update README with new uv commands and auto-detection documentation

[MrLYC]

Update README with new uv commands documentation

Summary

Documentation-only change to update the README with the new uv-related CLI commands and updated behavior introduced in PR #5.

Changes:

• Added overview bullet points for uv support
• Added full documentation for requirements-to-uv command
• Added full documentation for uv-to-requirements command
• Updated extract-private-packages and obfuscate-private-packages docs to note auto-detection behavior (uv.lock / poetry.lock) and the new --uv-path option

Review & Testing Checklist for Human

• Verify the documented options for requirements-to-uv and uv-to-requirements match the actual CLI definitions in versifier/__main__.py (lines 260-324). Note: Context.wrapper injects --poetry-path and --uv-path into all commands, but docs only list the relevant option per command — confirm this is the desired convention.
• Confirm the auto-detection priority description ("优先使用 uv") matches the actual code behavior in Context.package_manager (checks uv.lock first, then poetry.lock).

Notes

• No code changes; all 144 tests pass.
• Link to Devin run: https://app.devin.ai/sessions/5f8b53541d4f4f63b0c1d9b4cc29a839
• Requested by: @MrLYC

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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