BotServ kickers: caps + formatting, with DONTKICKOPS

The assigned bot now enforces kickers on channel lines: KICK <#channel>
CAPS ON [min [percent]], and BOLDS/COLORS/UNDERLINES/REVERSES/ITALICS
for control-code formatting. DONTKICKOPS exempts channel operators. A
tripping line is kicked by the bot itself.

Kicker config is a typed KickerSettings struct on the channel (event-
sourced like ChanSettings) with a violation() check; the engine runs it
on every channel PRIVMSG. Factored the founder-or-admin gate into a
shared require_channel_admin helper (assign/set/kick).

src/grpc.rs

@@ -137,6 +137,7 @@ fn to_wire(entry: &LogEntry) -> Option<ReplicationEvent> {
         | Event::ChannelAkickDel { .. }
         | Event::ChannelEntryMsgSet { .. }
         | Event::ChannelSettingsSet { .. }
+        | Event::ChannelKickerSet { .. }
         | Event::ChannelTopicSet { .. }
         | Event::ChannelSuspended { .. }
         | Event::ChannelUnsuspended { .. }