Fix missing opam dependencies across multiple packages
- atp: add re dependency
- frontmatter: add yamlt dependency
- init: convert bytesrw, eio, bytesrw-eio from depopts to real deps
- mdns: add cstruct, fmt, cmdliner, eio_main dependencies
- owntracks: add geojson, bytesrw dependencies
- tomlt: convert eio, jsont from depopts to real deps, remove (optional) from sublibraries
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>