Cleanup databases after logout

[corbanbrook]

New _cleanupWalletData(wallet) method (lines 1258–1280):

• Fetches all records from signatures, transactions, messages, and recovery databases in parallel
• Deletes any records belonging to the logged-out wallet address (using Address.isEqual for case-insensitive comparison)
• Best-effort cleanup of auth keys: fetches the wallet's loginTopology, extracts its signers, and deletes their corresponding AuthKey entries
• Auth key cleanup is wrapped in try/catch so an offline state won't block the logout

Soft logout (skipRemoveDevice: true branch, line 1201): calls _cleanupWalletData after the manager entry and device are removed.

Hard logout (completeLogout, line 1255): calls _cleanupWalletData after the configuration update is committed and the manager entry/device are removed.