Fix package managers for macOS/Linux compatibility

[Gabriel Dufresne (GabrielDuf)]

Summary

• Pip: Replace parse_pip_search dependency with a direct PyPI Simple Index lookup. Searches are now done by substring-matching against the full package name index with parallel version fetches. Adds --break-system-packages auto-retry when pip hits an externally-managed-environment error, and prefers pip3/pip standalone executables on non-Windows.

• Cargo: Add fallback to cargo install --list when cargo-update is not installed, so installed packages are always populated. Fix regex to match hyphenated crate names. Detect cargo-binstall at runtime and use plain cargo install when it is absent. Invalidate the installed-packages cache after a successful operation.

• PowerShell7: Source listing now tries Get-PSResourceRepository first and falls back to Get PSRepository, covering both old and new PowerShell module ecosystems. Switches to UseSubstringSearch on the NuGet search endpoint to avoid PSGallery silently omitting packages.

[Copilot]

Pull request overview

This PR improves cross-platform (macOS/Linux) behavior for several package managers by removing Windows-only assumptions, adding fallbacks when optional tools aren’t present, and making search/listing behavior more robust across differing ecosystems (PyPI, Cargo, PowerShell repositories).

Changes:

• vcpkg: make bootstrap/version output OS-aware and adjust uninstall behavior.
• pip: replace parse_pip_search with PyPI Simple Index-based search + caching; prefer standalone pip3/pip on non-Windows; add auto-retry for externally-managed environments.
• cargo + PowerShell7: add compatibility fallbacks (cargo-update absent, PSResourceRepository vs PSRepository) and adjust search semantics for PSGallery reliability.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/UniGetUI.PackageEngine.Managers.Vcpkg/Vcpkg.cs	Use OS-specific env-var formatting and bootstrap script execution for non-Windows.
src/UniGetUI.PackageEngine.Managers.Vcpkg/Helpers/VcpkgPkgOperationHelper.cs	Add recursive uninstall flag for vcpkg removals.
src/UniGetUI.PackageEngine.Managers.PowerShell7/PowerShell7.cs	Combine installed-package listing across scopes in one run; enable substring search behavior.
src/UniGetUI.PackageEngine.Managers.PowerShell7/Helpers/PowerShell7SourceHelper.cs	Prefer Get-PSResourceRepository, fallback to Get-PSRepository for broader compatibility.
src/UniGetUI.PackageEngine.Managers.Pip/Pip.cs	Implement PyPI Simple Index name cache + parallel version fetch; prefer pip3/pip on non-Windows; background pre-warm.
src/UniGetUI.PackageEngine.Managers.Pip/Helpers/PipPkgOperationHelper.cs	Add --break-system-packages option and auto-retry when PEP 668 blocks operations.
src/UniGetUI.PackageEngine.Managers.Generic.NuGet/BaseNuGet.cs	Add UseSubstringSearch switch and implement Packages() substring-based endpoint path.
src/UniGetUI.PackageEngine.Managers.Cargo/Helpers/CargoPkgOperationHelper.cs	Use cargo install when cargo-binstall missing; invalidate installed cache after success.
src/UniGetUI.PackageEngine.Managers.Cargo/Cargo.cs	Regex fixes; fallback to cargo install --list; runtime detection of cargo-binstall; cache invalidation hook.
src/UniGetUI.PackageEngine.Enums/OverridenInstallationOptions.cs	Add Pip override flag for --break-system-packages.
src/UniGetUI.Avalonia/Views/Pages/SettingsPages/PackageManagerPage.axaml.cs	Fix vcpkg name casing check; use command binding for vcpkg root picker card.

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