Add HelpServ: a help-desk ticket queue

Users open tickets with REQUEST (or HELPME); the queue is event-sourced
and, because a request is an event, the audit feed announces it to staff
and records it in the searchable log — so OperServ LOGSEARCH finds a ticket
by any word, the same trail as reports. A user can CANCEL their own open
ticket. Operators work the queue: LIST [ALL], VIEW, TAKE (claim), NEXT
(claim the oldest unassigned), CLOSE. Filing is rate-limited. Opt-in.

That completes the six third-party modules — all interconnected: they
share the account/channel/oper identity, the event-sourced store, and the
one audit/incident trail.

src/grpc.rs

@@ -181,6 +181,9 @@ fn to_wire(entry: &LogEntry) -> Option<ReplicationEvent> {
         | Event::GroupFounderSet { .. }
         | Event::GroupFlagsSet { .. }
         | Event::GroupMemberDel { .. }
+        | Event::HelpRequested { .. }
+        | Event::HelpTaken { .. }
+        | Event::HelpClosed { .. }
         | Event::OperGranted { .. }
         | Event::OperRevoked { .. }
         | Event::SessionExceptionAdded { .. }