style: remove unused synchronization imports

Eliminate unused Arc, Mutex, and RwLock imports to clean up codebase and reduce compiler warnings.

src/reflector_selector.rs

@@ -7,7 +7,7 @@ use std::collections::HashMap;
 use std::net::IpAddr;
 use std::sync::atomic::Ordering;
 use std::sync::mpsc::Receiver;
-use std::sync::{Arc, Mutex, RwLock};
+use std::sync::{Arc, RwLock};
 use std::thread::sleep;
 use std::time::Duration;