ClientRecord got its own MarshalJSON in the previous commit, and
ClientWithAttachments embeds it to add inboundIds and traffic. Go
promotes the embedded MarshalJSON to the outer struct, so the encoder
was calling ClientRecord.MarshalJSON for the whole value and silently
dropping the extras. The frontend reads row.inboundIds / row.traffic
from /clients/list, so attached inbounds didn't render and newly added
clients looked like they hadn't saved. Add an explicit MarshalJSON on
ClientWithAttachments that splices the extras in.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
