Add APT, DNF, and Pacman package managers for Linux

[Gabriel Dufresne (GabrielDuf)]

Summary

Adds native Linux package manager support to UniGetUI via three new managers:

• APT (apt/apt-cache) — Debian/Ubuntu-based distributions
• DNF (dnf/dnf5) — RHEL/Fedora-based distributions, with DNF5 (Fedora 41+) discovery
• Pacman (pacman) — Arch Linux and derivatives

Adds SVG icons for all three managers and registers them in PEInterface.

[Copilot]

Pull request overview

Adds native Linux package manager integration to the PackageEngine (APT/DNF/Pacman), wires the managers into PEInterface with basic distro-family detection, and updates elevation behavior/resources to support Linux workflows (including new SVG icons and icon registration).

Changes:

• Introduces three new PackageEngine manager projects: Apt, Dnf (incl. dnf5 discovery), and Pacman, each with details/operation helpers.
• Registers the new managers and icons via PEInterface and IconType, and adds corresponding SVG assets.
• Adds Linux-aware elevation setup (sudo/pkexec discovery + ElevatorArgs) and adjusts operation argument building / admin-rights caching behavior.

Reviewed changes

Copilot reviewed 24 out of 27 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
src/UniGetUI/Assets/Symbols/pacman.svg	Adds Pacman SVG symbol asset
src/UniGetUI/Assets/Symbols/dnf.svg	Adds DNF SVG symbol asset
src/UniGetUI/Assets/Symbols/apt.svg	Adds APT SVG symbol asset
src/UniGetUI.sln	Adds new manager projects to the solution and config mappings
src/UniGetUI.PackageEngine.PackageEngine/UniGetUI.PackageEngine.PEInterface.csproj	References new manager projects for non-Windows builds
src/UniGetUI.PackageEngine.PackageEngine/PEInterface.cs	Registers Apt/Dnf/Pacman managers and adds Linux distro-family detection
src/UniGetUI.PackageEngine.Operations/SourceOperations.cs	Adjusts elevation caching trigger and prepends ElevatorArgs to elevated commands
src/UniGetUI.PackageEngine.Operations/PackageOperations.cs	Adjusts elevation caching trigger and prepends ElevatorArgs to elevated commands
src/UniGetUI.PackageEngine.Managers.Pacman/UniGetUI.PackageEngine.Managers.Pacman.csproj	New Pacman manager project
src/UniGetUI.PackageEngine.Managers.Pacman/Pacman.cs	Implements Pacman manager (discovery, listing, updates, index refresh)
src/UniGetUI.PackageEngine.Managers.Pacman/Helpers/PacmanPkgOperationHelper.cs	Pacman operation parameter generation
src/UniGetUI.PackageEngine.Managers.Pacman/Helpers/PacmanPkgDetailsHelper.cs	Pacman package details parsing/install location logic
src/UniGetUI.PackageEngine.Managers.Dnf/UniGetUI.PackageEngine.Managers.Dnf.csproj	New Dnf manager project
src/UniGetUI.PackageEngine.Managers.Dnf/Helpers/DnfPkgOperationHelper.cs	Dnf operation parameter generation
src/UniGetUI.PackageEngine.Managers.Dnf/Helpers/DnfPkgDetailsHelper.cs	Dnf package details parsing/install location logic
src/UniGetUI.PackageEngine.Managers.Dnf/Dnf.cs	Implements Dnf manager (dnf/dnf5 discovery, listing, updates, index refresh)
src/UniGetUI.PackageEngine.Managers.Apt/UniGetUI.PackageEngine.Managers.Apt.csproj	New Apt manager project
src/UniGetUI.PackageEngine.Managers.Apt/Helpers/AptPkgOperationHelper.cs	Apt operation parameter generation
src/UniGetUI.PackageEngine.Managers.Apt/Helpers/AptPkgDetailsHelper.cs	Apt package details parsing/install location logic
src/UniGetUI.PackageEngine.Managers.Apt/Apt.cs	Implements Apt manager (discovery, listing, updates, index refresh)
src/UniGetUI.Interface.Enums/Enums.cs	Registers new icon enum values (Apt/Dnf/Pacman)
src/UniGetUI.Core.Tools/Tools.cs	Extends admin-rights caching/reset logic for Linux elevators
src/UniGetUI.Core.LanguageEngine/Assets/Languages/lang_en.json	Adds English strings for manager descriptions (APT/DNF)
src/UniGetUI.Core.Data/CoreData.cs	Adds CoreData.ElevatorArgs for elevators needing extra flags (e.g., sudo -A)
src/UniGetUI.Avalonia/Views/Controls/Settings/SettingsPageButton.cs	Refactors icon path mapping helper
src/UniGetUI.Avalonia/ViewModels/DialogPages/ManageIgnoredUpdatesViewModel.cs	Adds icon name mapping for apt/dnf/pacman
src/UniGetUI.Avalonia/Infrastructure/AvaloniaBootstrapper.cs	Adds Linux elevation tool discovery (sudo+askpass preferred, pkexec fallback)

Comments suppressed due to low confidence (3)

src/UniGetUI.PackageEngine.Operations/PackageOperations.cs:122

• On Linux this now always requests UAC/admin-rights caching whenever elevation is required. Combined with the current CacheUACForCurrentProcess implementation, this can attempt unsupported caching when the elevator is pkexec (or sudo without askpass), causing unnecessary prompts/failures. Consider only requesting caching when the selected elevator supports it (e.g., sudo with askpass/gsudo) or make CacheUACForCurrentProcess a safe no-op for unsupported elevators.

                if (
                    OperatingSystem.IsLinux()
                    || Settings.Get(Settings.K.DoCacheAdminRights)
                    || Settings.Get(Settings.K.DoCacheAdminRightsForBatches)
                )
                {
                    RequestCachingOfUACPrompt();

src/UniGetUI.PackageEngine.Operations/SourceOperations.cs:130

• Same as PackageOperations: on Linux this always calls RequestCachingOfUACPrompt when elevation is required. If CoreData.ElevatorPath resolves to pkexec (or sudo without askpass), CacheUACForCurrentProcess may not be supported and can trigger extra prompts/failures. Please gate caching requests to elevators that actually support caching, or ensure caching is a safe no-op for pkexec.

                if (
                    OperatingSystem.IsLinux()
                    || Settings.Get(Settings.K.DoCacheAdminRights)
                    || Settings.Get(Settings.K.DoCacheAdminRightsForBatches)
                )
                    RequestCachingOfUACPrompt();

src/UniGetUI.PackageEngine.Operations/SourceOperations.cs:236

• Same issue as the earlier SourceOperations hunk: Linux always requests caching when elevated, which can break/annoy users when the configured elevator is pkexec or sudo without askpass. Gate caching requests to supported elevators or make caching a no-op for pkexec.

                if (
                    OperatingSystem.IsLinux()
                    || Settings.Get(Settings.K.DoCacheAdminRights)
                    || Settings.Get(Settings.K.DoCacheAdminRightsForBatches)
                )
                    RequestCachingOfUACPrompt();

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