fix(rust): clean up unused Rust warnings in bridge, network, and server modules

rust/src/bridge.rs

@@ -13,7 +13,7 @@ use std::net::Ipv4Addr;
 use std::sync::Arc;
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::sync::mpsc;
-use tracing::{debug, error, info, warn};
+use tracing::{debug, info, warn};
 
 use crate::server::ServerState;
 

rust/src/network.rs

@@ -8,6 +8,7 @@ pub struct IpPool {
     /// Network address (e.g., 10.8.0.0)
     network: Ipv4Addr,
     /// Prefix length (e.g., 24)
+    #[allow(dead_code)]
     prefix_len: u8,
     /// Allocated IPs: IP -> client_id
     allocated: HashMap<Ipv4Addr, String>,

rust/src/server.rs

@@ -319,7 +319,7 @@ impl VpnServer {
 
                 // Socket engine setup
                 let (s_tx, s_rx) = mpsc::channel::<Vec<u8>>(4096);
-                let (s_shut_tx, s_shut_rx) = mpsc::channel::<()>(1);
+                let (_s_shut_tx, s_shut_rx) = mpsc::channel::<()>(1);
 
                 // Bridge engine setup
                 let phys_iface = match &config.bridge_physical_interface {