fix(linux): update systemd service units

[psyke83]

Description

• xdg-desktop-autostart.target is not used by vanilla GNOME sessions, so use graphical-session.target as the service enablement dependency.
• Specify graphical-session.target, xdg-desktop-autostart.target and xdg-desktop-portal.service (unprivileged) to run before Sunshine, but leave as weak ordering hints by only specifying via the After unit fields.

Screenshot

Issues Fixed or Closed

• Closes fix(linux): fix systemd service file #4561

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[psyke83]

A change that could be made in the case of the unprivileged service is to add:

[Unit]
Wants = xdg-desktop-portal.service

This would set up a weak dependency, so if the service exists on the system but was not scheduled to start, it would be started. XDG Desktop Portal needs this, but the unprivileged user service can also be used for x11 and wlroots capture, so I don't think we should assume it to be a requirement. Users may have deliberately disabled this service and may not appreciate Sunshine starting it, so I don't recommend setting this.

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 15.52%. Comparing base (9ba2757) to head (b15529e).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4712      +/-   ##
==========================================
- Coverage   15.53%   15.52%   -0.01%     
==========================================
  Files          97       97              
  Lines       20476    20476              
  Branches     9400     9400              
==========================================
- Hits         3181     3179       -2     
+ Misses      16065    13660    -2405     
- Partials     1230     3637    +2407     

Flag	Coverage Δ
Archlinux	11.19% <ø> (ø)
FreeBSD-14.3-aarch64	?
FreeBSD-14.3-amd64	13.22% <ø> (-0.02%)	⬇️
Homebrew-ubuntu-22.04	13.42% <ø> (ø)
Linux-AppImage	11.60% <ø> (ø)
Windows-AMD64	13.49% <ø> (ø)
Windows-ARM64	12.35% <ø> (ø)

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see 47 files with indirect coverage changes