Update go.mod requires and all .go imports from forge.lthn.ai/core/*
to dappco.re/go/core/* per the version map:
- go-io v0.1.7 → dappco.re/go/core/io v0.2.0
- go-log v0.0.4 → dappco.re/go/core/log v0.1.0
- go-i18n v0.1.7 → dappco.re/go/core/i18n v0.2.0
- go-ws v0.2.5 → dappco.re/go/core/ws v0.3.0
- api v0.1.5 → dappco.re/go/core/api v0.2.0
- go v0.3.3 → dappco.re/go/core v0.5.0
forge.lthn.ai/core/cli left unchanged (not in migration scope).
Fix pre-existing test assertion in codesign_test.go.
Deduplicate setup logic in release.go via extracted helpers.
Co-Authored-By: Virgil <virgil@lethean.io>