refactor(Windows): mark protocol headers C++-only

[ReenigneArcher]

Description

Update the shared Windows protocol headers to explicitly be C++-only and remove legacy C compatibility paths. This drops the #else constant/enums and extern "C" wrappers, leaving a single C++ definition path with inline constexpr, scoped enums, and the existing packed protocol structs.

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 30.43478% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.70%. Comparing base (605bf93) to head (8a26ec7).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/platform/windows/windows_license.cpp	0.00%	15 Missing ⚠️
src/platform/windows/windows_backend.cpp	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   74.76%   74.70%   -0.07%     
==========================================
  Files          33       33              
  Lines        7910     7906       -4     
  Branches     2968     2966       -2     
==========================================
- Hits         5914     5906       -8     
+ Misses       1658     1421     -237     
- Partials      338      579     +241     

Flag	Coverage Δ
FreeBSD	50.96% <100.00%> (ø)
Linux-Clang	56.64% <100.00%> (ø)
Linux-GCC	67.52% <100.00%> (ø)
Windows-MSVC	87.90% <100.00%> (-0.17%)	⬇️
Windows-MinGW-UCRT64	64.28% <30.43%> (+0.03%)	⬆️
macOS	50.28% <100.00%> (ø)

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

Files with missing lines	Coverage Δ
src/platform/windows/control_protocol.hpp	100.00% <100.00%> (ø)
...rm/windows/shared/playstation_feature_protocol.hpp	95.09% <100.00%> (ø)
src/platform/windows/windows_broker_client.hpp	80.00% <100.00%> (ø)
src/platform/windows/windows_backend.cpp	84.05% <50.00%> (-0.65%)	⬇️
src/platform/windows/windows_license.cpp	0.00% <0.00%> (ø)

... and 5 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