Update clients to use regenerated Peer_tube module
- Rename Peertube module references to Peer_tube in client library
- Refactor bushel_peertube to use generated Peer_tube types
- Remove hand-coded JSON codecs in favor of generated ones
- Add helper functions to extract values from Jsont.json for untyped fields
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>