fix(license)!: remove expiration-based license validation

[ReenigneArcher]

Description

Validate annual subscriptions using recent Polar entitlement checks, normalize pasted license keys, and keep activation available despite stale broker status.

BREAKING CHANGE: Remove expires_at from the public license status and broker protocol.

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

[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

[codecov]

Codecov Report

❌ Patch coverage is 61.53846% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.31%. Comparing base (6b06ea9) to head (119fe00).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
tools/virtualhid_control.cpp	0.00%	5 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #88 +/- ##
==========================================
+ Coverage 75.24% 75.31% +0.07% 
==========================================
Files 34 34 Lines 8086 8091 +5 Branches 3029 3030 +1 ==========================================
+ Hits 6084 6094 +10 + Misses 1722 1417 -305 - Partials 280 580 +300 

Flag	Coverage Δ
FreeBSD	51.63% <ø> (ø)
Linux-Clang	57.41% <83.33%> (+0.06%)	⬆️
Linux-GCC	68.09% <83.33%> (+0.05%)	⬆️
Windows-MSVC	88.37% <100.00%> (+0.06%)	⬆️
Windows-MinGW-UCRT64	64.94% <45.45%> (+0.06%)	⬆️
macOS	51.12% <100.00%> (+0.11%)	⬆️

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

Files with missing lines	Coverage Δ
src/include/libvirtualhid/license.hpp	100.00% <ø> (ø)
src/platform/windows/windows_license.cpp	0.00% <ø> (ø)
tools/virtualhid_control_model.cpp	98.08% <100.00%> (+0.07%)	⬆️
tools/virtualhid_control.cpp	0.00% <0.00%> (ø)

... and 10 files with indirect coverage changes

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