OperServ: NEWS — logon and oper announcements

NEWS ADD <LOGON|OPER> <text> / DEL <LOGON|OPER> <number> / LIST. Logon news
is shown to every user as they connect; oper news is shown to an operator
when they log in. Admin-only to manage. Each item carries a stable id
assigned at add time and embedded in the log, so deletion is order-
independent under replay (DEL by number resolves to that id).

Enabling groundwork: the replicated network-wide lists (bans, now news)
are consolidated into one NetData struct threaded through apply() as a
single parameter — this replaces the akill parameter rather than adding
one, so the fold stays within its argument budget as the lists grow.

src/grpc.rs

@@ -170,7 +170,9 @@ fn to_wire(entry: &LogEntry) -> Option<ReplicationEvent> {
         | Event::AccountExpiryWarned { .. }
         | Event::ChannelExpiryWarned { .. }
         | Event::AccountOperNoteSet { .. }
-        | Event::ChannelOperNoteSet { .. } => return None,
+        | Event::ChannelOperNoteSet { .. }
+        | Event::NewsAdded { .. }
+        | Event::NewsDeleted { .. } => return None,
     };
     Some(ReplicationEvent { origin: entry.origin().to_string(), seq: entry.seq(), lamport: entry.lamport(), kind: Some(kind) })
 }