add LAN accessibility indicator for services

Show whether each service is reachable from the network or bound to
localhost only. Dashboard displays green "LAN" or amber "local only"
badge next to each healthy service. Unified TCP check function,
concurrent health+LAN probes.

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

src/api.rs

@@ -590,6 +590,7 @@ struct ServiceResponse {
     target_port: u16,
     url: String,
     healthy: bool,
+    lan_accessible: bool,
 }
 
 #[derive(Deserialize)]
@@ -609,22 +610,38 @@ async fn list_services(State(ctx): State<Arc<ServerCtx>>) -> Json<Vec<ServiceRes
     };
     let tld = &ctx.proxy_tld;
 
-    // Run all health checks concurrently
-    let health_futures: Vec<_> = entries
+    let lan_ip = crate::lan::detect_lan_ip();
+
+    let check_futures: Vec<_> = entries
         .iter()
-        .map(|(_, port)| check_health(*port))
+        .map(|(_, port)| {
+            let port = *port;
+            let localhost = std::net::SocketAddr::from(([127, 0, 0, 1], port));
+            let lan_addr = lan_ip.map(|ip| std::net::SocketAddr::new(ip.into(), port));
+            async move {
+                let healthy = check_tcp(localhost).await;
+                let lan_accessible = match lan_addr {
+                    Some(addr) => check_tcp(addr).await,
+                    None => false,
+                };
+                (healthy, lan_accessible)
+            }
+        })
         .collect();
-    let health_results = futures::future::join_all(health_futures).await;
+    let check_results = futures::future::join_all(check_futures).await;
 
     let results: Vec<_> = entries
         .into_iter()
-        .zip(health_results)
-        .map(|((name, port), healthy)| ServiceResponse {
-            url: format!("http://{}.{}", name, tld),
-            name,
-            target_port: port,
-            healthy,
-        })
+        .zip(check_results)
+        .map(
+            |((name, port), (healthy, lan_accessible))| ServiceResponse {
+                url: format!("http://{}.{}", name, tld),
+                name,
+                target_port: port,
+                healthy,
+                lan_accessible,
+            },
+        )
         .collect();
     Json(results)
 }
@@ -655,7 +672,15 @@ async fn create_service(
     let tld = &ctx.proxy_tld;
     ctx.services.lock().unwrap().insert(&name, req.target_port);
 
-    let healthy = check_health(req.target_port).await;
+    let localhost = std::net::SocketAddr::from(([127, 0, 0, 1], req.target_port));
+    let lan_addr =
+        crate::lan::detect_lan_ip().map(|ip| std::net::SocketAddr::new(ip.into(), req.target_port));
+    let (healthy, lan_accessible) = tokio::join!(check_tcp(localhost), async {
+        match lan_addr {
+            Some(a) => check_tcp(a).await,
+            None => false,
+        }
+    });
     Ok((
         StatusCode::CREATED,
         Json(ServiceResponse {
@@ -663,6 +688,7 @@ async fn create_service(
             name,
             target_port: req.target_port,
             healthy,
+            lan_accessible,
         }),
     ))
 }
@@ -679,10 +705,10 @@ async fn remove_service(State(ctx): State<Arc<ServerCtx>>, Path(name): Path<Stri
     }
 }
 
-async fn check_health(port: u16) -> bool {
+async fn check_tcp(addr: std::net::SocketAddr) -> bool {
     tokio::time::timeout(
         std::time::Duration::from_millis(100),
-        tokio::net::TcpStream::connect(format!("127.0.0.1:{}", port)),
+        tokio::net::TcpStream::connect(addr),
     )
     .await
     .map(|r| r.is_ok())