Add XLibre X server detection and NVIDIA driver support

[ericbsd]

• Add detect_x_server() function to identify XLibre vs Xorg
• Automatically prefix NVIDIA driver packages with 'xlibre-' when XLibre is detected
• Maintain backward compatibility with standard Xorg packages
• Enhanced error reporting to include both nvidia and xlibre package searches

Summary by Sourcery

Detect XLibre versus Xorg servers and adjust NVIDIA driver package names accordingly while preserving compatibility and enhancing error reporting

New Features:

• Introduce detect_x_server function to distinguish between XLibre and Xorg
• Automatically prefix NVIDIA driver packages with "xlibre-" when XLibre is detected

Enhancements:

• Maintain backward compatibility with standard Xorg NVIDIA packages
• Improve error reporting to include searches for both NVIDIA and xlibre driver packages

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Introduces XLibre server detection in xconfig and adjusts NVIDIA driver package resolution to support both XLibre-prefixed and standard Xorg naming, with improved fallback logic and error messages.

File-Level Changes

Change	Details	Files
Add X server type detection	Introduce detect_x_server() to distinguish XLibre vs Xorg Invoke detect_x_server() early and store the result in a variable	bin/xconfig
Prefix NVIDIA driver packages for XLibre	When XLibre is detected, automatically prepend 'xlibre-' to NVIDIA package names Adjust driver installation logic to use the prefixed names	bin/xconfig
Maintain standard Xorg package fallback	If prefixed NVIDIA packages are unavailable, fall back to standard names Ensure existing Xorg workflows remain unaffected by new logic	bin/xconfig
Enhance error reporting for driver resolution	Report both prefixed and standard package names on search failure Provide clear messaging about which driver names were attempted	bin/xconfig

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