v0.1.1 - hardening pass

Hardening pass from a design review of Phase 1. No new features; this is the recommended build for daily use while the overlay (Phase 2) is developed.

Improvements

• Hotkeys and the media connection now survive workstation lock/unlock; both re-register automatically on unlock
• File logging to %APPDATA%\GameDeck\logs (7-day retention) so problems are diagnosable; no data leaves your machine
• Track-change notifications no longer fire on playback-position ticks, and progress is interpolated locally between the coarse updates some players emit
• The single-instance guard is per-user, so another account on the same PC can run its own copy
• "Start with Windows" lives only in the registry Run key, matching what Task Manager's Startup tab shows

Fixes

• Session bookkeeping no longer accumulates entries for media apps that have closed

Install steps are the same as v0.1.0. Full details in the CHANGELOG.