Deleting an inbound now only detaches its clients (removes the
client_inbounds rows). It no longer deletes client_traffics or client IP
logs: those are keyed centrally by email (one row per client) and must
survive, since a client may stay attached to other inbounds and is
managed from the Clients page.
Separately, /get/:id now uses a new GetInboundDetail that preloads and
enriches ClientStats, so hydrated records (info / QR / export) carry
per-client traffic instead of null. DBInbound.toJSON drops the internal
_clientStatsMap cache so it no longer leaks into the exported JSON.
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