feat: sync GameDB Steam presets directly

[ReenigneArcher]

Description

• Import PC games with one unambiguous Steam external ID from GameDB's published gh-pages branch directly into PresetDB's database branch.
• Commit and push each changed game JSON file separately. Skip unchanged files, retry database branch races, and let the next daily run continue after a timeout.
• Keep issue-backed preset IDs numeric and their launch values contributor-managed. Direct imports use the stable steam ID, have no issue provenance, and cannot be replaced through an issue.
• Run daily at 07:00 UTC, using the standard checkout action and the GitHub job timeout. Dispatch one Pages build when any files were published.
• Bound concurrent ProtonDB lookups during Pages builds as the Steam catalog grows.

Screenshot

Issues Fixed or Closed

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

See our AI usage policy.

• 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

[codecov]

Codecov Report

❌ Patch coverage is 96.79144% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.45%. Comparing base (fcd035a) to head (7191c6f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/gamedb-sync.js	95.89%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   88.51%   89.45%   +0.94%     
==========================================
  Files          13       14       +1     
  Lines        1306     1480     +174     
==========================================
+ Hits         1156     1324     +168     
- Misses        150      156       +6     

Files with missing lines	Coverage Δ
src/build-site.js	90.19% <100.00%> (+1.43%)	⬆️
src/database.js	95.23% <100.00%> (ø)
src/record.js	100.00% <100.00%> (ø)
src/gamedb-sync.js	95.89% <95.89%> (ø)

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[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