KeepClip 1.0.0

Add one-click Windows installer (Inno Setup)

KeepClip-Setup.exe sets everything up automatically: installs Python if
missing, creates the venv, installs dependencies, downloads ffmpeg, and
creates desktop/Start-menu shortcuts that launch the app with no console.

- installer/KeepClip.iss   - Inno Setup build script
- installer/bootstrap.ps1  - post-install setup (Python/venv/pip/ffmpeg)
- installer/keepclip.ico   - app icon
- keepclip.vbs             - silent launcher used by the shortcut

The built .exe is git-ignored; it is distributed via GitHub Releases.