fix pip bad interpreter

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[Copilot]

Pull Request Overview

This PR adds shebang line fixing functionality to prevent Python interpreter path issues. The change addresses problems where Python scripts point to temporary directories that become invalid after build completion.

• Adds comprehensive shebang fixing functionality with health checking
• Integrates automatic shebang fixing into the Python build process
• Implements pre-use hooks to verify and fix Python installations before switching versions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
lib/util.lua	Adds shebang fixing functions, health checking, and batch processing utilities
hooks/pre_use.lua	Implements pre-use hook to verify and fix Python installations before version switching

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