feat(FreeBSD): Add backend support

[ReenigneArcher]

Description

Refactors CI into reusable workflow-call pipelines (ci-driver, ci-build, ci-results) and updates the top-level ci.yml to orchestrate release setup, Windows driver packaging/signing, cross-platform library builds (now including FreeBSD), and Codecov uploads.

Adds FreeBSD platform support details across build and runtime behavior: enables threaded use on FreeBSD, applies required Clang libc++ experimental flags, extends the Linux/uhid backend implementation to support FreeBSD uinput paths and platform-specific capability/effective-profile handling, and wires in new FreeBSD integration tests. Documentation is updated to describe FreeBSD’s uinput-based feature subset and integration expectations.

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 83.92857% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.76%. Comparing base (a0560b7) to head (e49cbdb).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/platform/linux/uhid_backend.cpp	81.25%	3 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   74.48%   74.76%   +0.28%     
==========================================
  Files          33       33              
  Lines        7869     7910      +41     
  Branches     2954     2968      +14     
==========================================
+ Hits         5861     5914      +53     
+ Misses       1728     1439     -289     
- Partials      280      557     +277     

Flag	Coverage Δ
FreeBSD	50.96% <67.34%> (?)
Linux-Clang	56.64% <76.47%> (+0.08%)	⬆️
Linux-GCC	67.52% <91.17%> (+0.08%)	⬆️
Windows-MSVC	88.06% <75.00%> (+0.14%)	⬆️
Windows-MinGW-UCRT64	64.25% <71.42%> (+<0.01%)	⬆️
macOS	50.28% <33.33%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/core/backend.hpp	82.35% <100.00%> (+0.35%)	⬆️
src/core/runtime.cpp	83.54% <100.00%> (+1.52%)	⬆️
src/platform/linux/uhid_backend.cpp	80.99% <81.25%> (-0.04%)	⬇️

... and 10 files with indirect coverage changes

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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