chanserv: channel SUSPEND / UNSUSPEND (oper-gated)

Freezes a channel gated on Priv::Suspend: a typed Suspension on ChannelInfo
(event-logged, snapshotted, lazy expiry — same shape as the account one, no
Anope Extensible/Checker or expiry timer). While suspended, ChanServ refuses
all management (guards in require_op/require_founder and the founder-inline
SET/DROP/MLOCK), the engine skips Join enforcement (no auto-op/akick/entrymsg),
and suspending kicks everyone out; INFO shows it. parse_duration moved into the
SDK so both SUSPEND commands share it. Data + full-flow tests.

src/grpc.rs

@@ -133,7 +133,9 @@ fn to_wire(entry: &LogEntry) -> Option<ReplicationEvent> {
         | Event::ChannelAkickDel { .. }
         | Event::ChannelEntryMsgSet { .. }
         | Event::ChannelSettingsSet { .. }
-        | Event::ChannelTopicSet { .. } => return None,
+        | Event::ChannelTopicSet { .. }
+        | Event::ChannelSuspended { .. }
+        | Event::ChannelUnsuspended { .. } => return None,
     };
     Some(ReplicationEvent { origin: entry.origin().to_string(), seq: entry.seq(), lamport: entry.lamport(), kind: Some(kind) })
 }