Polish Windows 11 tweaks and add one-click updates

[PrimeBuild-pc]

Summary

• detect all supported system tweaks once during every app startup and re-read their persisted Windows state after changes
• replace locale-dependent powercfg parsing with native PowrProf reads/writes, correct the MMCSS Games tweak, and remove the unsupported HPET performance toggle
• refine tweak toggles and selected-state styling to match neutral Windows 11 surfaces
• check GitHub Releases on every enabled app startup and prompt immediately when an update exists
• after one consent, download and verify the installer, run it silently, close ThreadPilot, preserve %AppData% settings, and relaunch the app automatically
• remove the obsolete update interval UI and dead abstractions identified by the Ponytail audit

Root cause

The existing updater throttled startup checks for up to seven days and only directed the user to Settings. The installer was also launched without update-mode arguments and did not relaunch ThreadPilot.

Validation

• 634/634 Release tests passed on the current main
• Release single-file publish passed
• packaged executable smoke test passed (--smoke-test, exit code 0)
• Inno Setup compiled a v1.5.0 installer successfully
• git diff --check passed

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Codecov Report

❌ Patch coverage is 29.66507% with 147 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Services/SystemTweaksService.cs	0.00%	107 Missing ⚠️
MainWindow.Behaviors.partial.cs	0.00%	27 Missing ⚠️
ViewModels/SystemTweaksViewModel.cs	83.87%	7 Missing and 3 partials ⚠️
Services/UpdateService.cs	0.00%	2 Missing ⚠️
ViewModels/SettingsViewModel.cs	0.00%	1 Missing ⚠️

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