Fix 3 warnings: unused import, unused variable, dead code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-server/src/routes/ws.rs

@@ -65,7 +65,7 @@ async fn handle_socket(socket: WebSocket, state: AppState, fingerprint: String)
     }
 
     // Spawn task to forward push messages to WS
-    let fp_clone = fingerprint.clone();
+    let _fp_clone = fingerprint.clone();
     let mut push_task = tokio::spawn(async move {
         while let Some(msg) = push_rx.recv().await {
             if ws_tx.send(Message::Binary(msg.into())).await.is_err() {