chore(lint): extend low-risk clippy cleanup batch

- normalize numeric literals (115_200) in hardware/peripheral config paths

- remove test-only useless format! allocations in discord IDs

- simplify closures and auto-deref in browser/http/rag/peripherals

- keep behavior unchanged while reducing warning surface

src/peripherals/serial.rs

@@ -76,7 +76,7 @@ impl SerialTransport {
         let mut port = self.port.lock().await;
         let resp = tokio::time::timeout(
             std::time::Duration::from_secs(SERIAL_TIMEOUT_SECS),
-            send_request(&mut *port, cmd, args),
+            send_request(&mut port, cmd, args),
         )
         .await
         .map_err(|_| {