Fix stale provider metadata and release asset matching

[Vysp3r]

Category

• Bugfix
• Feature
• Code style update
• Refactoring
• Build related changes
• Documentation
• Translation
• Other (Please specify!)

Overview

Fix several provider definitions that drifted from their current upstream projects.

This change:

• updates Proton-EM to the canonical BananaWorks07/Proton repository
• keeps the old Proton-EM releases endpoint as a legacy endpoint alias so existing installed metadata can still resolve
• updates Proton-EM documentation links
• updates DXVK-Sarek asset matching for v1.13.0 and newer dxvk-sarek-<version> archives
• preserves compatibility with DXVK-Sarek's historical asset naming: unified archives, dyasync, async, and legacy non-async builds
• updates the DXVK-Sarek description to reflect its Vulkan 1.1/1.2 and older-GPU focus
• corrects Proton-GE's x86_64 variant display name while keeping its stable x86 variant ID
• lets saved variant selections fall back to the stable variant ID when a display name changes
• replaces the informal DW-Proton description with clearer provider metadata
• updates fixtures and focused regression tests for the affected providers and selection behavior

Issue Number

Related issue: N/A

New Variables or Dependencies

None.

How to Test

1. Run the complete test suite:

   make tests

2. Confirm Proton-EM loads releases from:

   https://api.github.com/repos/BananaWorks07/Proton/releases
   

3. Confirm installed metadata using the previous Proton-EM endpoint still resolves through the legacy alias:

   https://api.github.com/repos/Etaash-mathamsetty/Proton/releases
   

4. Confirm DXVK-Sarek release naming resolves across generations:

   v1.13.0 -> dxvk-sarek-1.13.0.tar.gz
   v1.12.0 -> dxvk-sarek-dyasync-v1.12.0.tar.gz
   v1.11.0 -> dxvk-sarek-async-v1.11.0.tar.gz
              dxvk-sarek-v1.11.0.tar.gz
   

   v1.13.0 is a unified build where dyasync, async, or none is selected at runtime; older releases shipped separate archive flavors.
5. Confirm Proton-GE displays its default desktop build as x86_64.
6. With an existing saved Proton-GE variant value of x86, confirm the same stable variant remains selected after the display-name correction.

Screenshots (if applicable)

Not applicable; changes are limited to provider metadata, release matching, and variant labels.

Checklist

• My code follows the project's style guide.
• I have tested my changes and verified that they work as expected.
• I have updated the documentation accordingly (if applicable).
• I have updated the translations by running ./scripts/build.sh translations (if applicable).
• I have checked for existing pull requests that cover these changes.