Podcast USB v0.6.1

- First public Windows distribution on Hasbreo.
- Fresh installations start with an empty podcast lineup and no private feeds.
- Existing subscriptions/settings are retained when updating.
- A first-use hint explains podcast search and adding private RSS feeds.
- GitHub source, tested Windows packaging, archived builds and automatic Hasbreo
  publication make future releases repeatable.
- All v0.6 audio, USB presence, title previews and progress behaviour retained.
