bark, bark-cli: Add mailbox_pubkey to enable offline bark address generation

Gideon Baturerequested to merge
GideonBature/bark:bark-address into master

This MR introduces support for storing a mailbox public key in wallet properties.

Previously, generating a bark address required an active connection to the Ark server. With this update, the mailbox public key is persisted locally, allowing bark address generation to work offline.

Includes database migration, persistence updates, and test coverage.

  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Closes #1210 (closed)

Edited by Gideon Bature

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