HostServ: vhost OFFER menu, plus SETALL/DELALL/GROUP

A curated self-serve menu: operators OFFER <host> / OFFERDEL <n>, anyone
sees OFFERLIST, and a user picks one with TAKE <n> (assigned and applied
at once). Offers are a global event-sourced list (VhostOfferAdded/Removed,
threaded through apply like bots). SETALL/DELALL alias SET/DEL and GROUP
is a no-op reassurance, since the per-account vhost already covers every
grouped nick.

src/grpc.rs

@@ -152,7 +152,9 @@ fn to_wire(entry: &LogEntry) -> Option<ReplicationEvent> {
         | Event::ChannelBotAssigned { .. }
         | Event::ChannelBotUnassigned { .. }
         | Event::BotAdded(_)
-        | Event::BotRemoved { .. } => return None,
+        | Event::BotRemoved { .. }
+        | Event::VhostOfferAdded { .. }
+        | Event::VhostOfferRemoved { .. } => return None,
     };
     Some(ReplicationEvent { origin: entry.origin().to_string(), seq: entry.seq(), lamport: entry.lamport(), kind: Some(kind) })
 }