Inbounds page:
- AttachClientsModal now shows a per-client selection table (email,
comment, enabled tag) with search and a live "selected of total"
counter; all clients are pre-selected so the old "attach all"
workflow stays a single OK click.
- New DetachClientsModal on the inbound row menu lets you pick which
clients to remove from that inbound (records are kept so they can be
re-attached later; for full removal use Delete).
Clients page:
- New "Attach (N)" bulk-action button + BulkAttachInboundsModal that
attaches selected clients to one or more multi-user inbounds.
- New "Detach (N)" bulk-action button + BulkDetachInboundsModal that
removes selected clients from chosen inbounds; (email, inbound) pairs
where the client isn't attached are silently skipped.
Backend adds POST /panel/api/clients/bulkDetach, wrapping the existing
Detach service for each email and reporting per-email
detached/skipped/errors. ClientRecord rows are kept on detach to match
the single-client endpoint; bulkDel remains the path for full removal.
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