Clippy sweep: clean across the workspace

- Box the oversized enum variants (Event::AccountRegistered, gossip
  Msg::Entry) so small events aren't sized to a full Account; serde is
  transparent so the wire/log format is unchanged.
- Use the configured server description in the SERVER line (it was
  hardcoded and the config field went unread).
- Derive the ChanServ SET label from the ChanSetting (drops toggle's 8th
  arg); rename inspircd from_us -> sourced.
- allow the two framework-idiom lints with rationale (tonic's Status in
  authorize; the guest-rename handler's inherent arg count).
- Auto-fixed map_or/contains/split_once style lints.

src/grpc.rs

@@ -42,6 +42,9 @@ const SUBSCRIBER_BUFFER: usize = 1024;
 // Every RPC (both services) needs `authorization: Bearer <token>` matching the
 // configured secret. Constant-time compare — same posture as password/secret
 // checks elsewhere in this codebase, cheap insurance against a timing side-channel.
+// Status is tonic's error type, used by every RPC — boxing it here would fight
+// the framework's convention for marginal size gain.
+#[allow(clippy::result_large_err)]
 fn authorize<T>(req: &Request<T>, token: &str) -> Result<(), Status> {
     let got = req
         .metadata()
@@ -409,7 +412,7 @@ mod tests {
             vhost: None,
             vhost_request: None,
         };
-        let registered = LogEntry::for_test("A", 0, 1, Event::AccountRegistered(acct));
+        let registered = LogEntry::for_test("A", 0, 1, Event::AccountRegistered(Box::new(acct)));
         let wire = to_wire(&registered).expect("account registration replicates");
         match wire.kind {
             Some(Kind::AccountRegistered(a)) => {