feat(setup): add install.sh for single command setup/update

[HelpfulSoft1207]

Description

Adds automated installation script for Linux Arctis Manager with support for multiple Linux distributions. The script intelligently detects the system and uses the appropriate installation method: AUR for Arch-based systems or pipx for other distributions. It handles both fresh installations and upgrades seamlessly.

Changes

• Arch Detection: Detects Arch Linux and installs directly from AUR using yay or paru, with full automatic configuration.
• Else: For non-Arch systems, downloads the latest release from GitHub and installs via pipx, with pipx availability checking.
• Upgrade Logic: Checks if linux-arctis-manager is already installed and uses --force flag only when upgrading.
• Configuration Management: Automatically runs lam-cli setup --systray-autostart --start-now for non-Arch installs; Arch AUR package handles this automatically.
• Error Handling: Provides clear error messages for missing dependencies (pipx on non-Arch systems, AUR helpers on Arch systems).

Will put in another PR, or have @ifeign add it to their ongoing documentation changes, for the install instructions.

Can be installed with curl -LsSf https://raw.githubusercontent.com/elegos/Linux-Arctis-Manager/refs/heads/develop/scripts/install.sh | sh