fix: solve the bug of (un)installation scripts and Linux build target

[KercyDing]

Description

This PR fixes critical bugs in installation/uninstallation scripts and improves the Linux build compatibility by switching to musl for static linking.

Changes

Installation Scripts

• Auto-configure shell integration: Installation scripts now automatically write initialization code to shell config files without prompting users
• Fix shell detection logic: Improved regex to distinguish actual initialization code from comments
• PowerShell execution policy check: Added upfront check with helpful error messages for restricted execution policies
• Consistent profile handling: All scripts now use $PROFILE.CurrentUserAllHosts (profile.ps1) to support all PowerShell hosts (Console, VSCode, etc.)

Uninstallation Scripts

• Support multiple installation methods: Detect and remove binaries from cargo, install script, and manual installations
• Simplified cleanup: Remove unnecessary prompts and backups for profile modifications
• Fixed deletion logic: Use line-by-line filtering instead of complex regex to ensure reliable removal

Build System

• Linux musl target: Changed from x86_64-unknown-linux-gnu to x86_64-unknown-linux-musl for static linking
• Broad compatibility: Generated binaries now work across all Linux distributions without GLIBC version conflicts

Project Organization

• Moved scripts: Relocated all install/uninstall scripts to scripts/ directory
• Updated documentation: Corrected all script paths in README and INTRO

Documentation

• Clearer installation instructions: Updated README with platform-specific steps including PATH configuration
• Manual installation guide: Added complete manual setup instructions with shell integration

Checklist

• I have performed a self-review of my own code.
• I have added tests that prove my feature works or my fix is effective.
• I have updated the documentation accordingly.
• All new and existing tests passed.