nostrmo: Namecoin .bit NIP-05 resolution (Flutter/Dart)
A PR against haorendashu/nostrmo adds Namecoin .bit NIP-05 resolution to nostrmo's existing NIP-05 path. App-local helper plus two two-line branches at the existing call sites; SDK submodule untouched. Sixth shipping reference implementation of Namecoin NIP-05 across five runtimes (Kotlin, Swift, JS, Dart, now Flutter).
