fix(discovery): use protobufs Maven dep after rebase onto #5675

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#5275 created :feature:discovery with implementation(projects.core.proto), but
main's #5675 replaced the :core:proto submodule with the org.meshtastic:protobufs
Maven artifact. Rebasing left a stale module reference. Switched to
implementation(libs.meshtastic.protobufs), matching the convention (cf. feature/node).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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