Add bilingual support, clipboard toggle, MSI installer, disable Relea…

…se logging

- Strings.cs: bilingual (zh/en) UI strings auto-detected from system locale
- Ribbon.xml: all labels use getLabel callbacks for i18n
- AddIn.cs: clipboard monitor toggle button, bilingual callbacks
- Logger.cs / ClipboardMonitor.cs: [Conditional('DEBUG')] to disable logging in Release
- Scripts: moved Register/Unregister scripts to Scripts/ folder
- Setup: WiX v4 MSI installer project
- README: bilingual, zero-width space explanation, MSI install option