Update go.mod module line from forge.lthn.ai/core/go-p2p to
dappco.re/go/core/p2p. Migrate core dependency paths: go-log to
dappco.re/go/core/log v0.1.0, go-io to dappco.re/go/core/io v0.2.0.
Update all .go import paths across 18 source files. Borg, Poindexter,
and Enchantrix dependencies remain on forge.lthn.ai as they have not
been migrated upstream.
Co-Authored-By: Virgil <virgil@lethean.io>