Implement WakeOnLAN functionality and offline status handling

- Add WakeOnLAN support for offline hosts using 'w' key
- Configure MAC addresses for all infrastructure hosts
- Implement Status::Offline for disconnected hosts
- Exclude offline hosts from status aggregation to prevent false alerts
- Update versions to 0.1.55

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.54"
+version = "0.1.55"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/mod.rs

@@ -637,11 +637,14 @@ impl TuiApp {
             return;
         }
 
-        // Calculate worst-case status across all hosts
+        // Calculate worst-case status across all hosts (excluding offline)
         let mut worst_status = Status::Ok;
         for host in &self.available_hosts {
             let host_status = self.calculate_host_status(host, metric_store);
-            worst_status = Status::aggregate(&[worst_status, host_status]);
+            // Don't include offline hosts in status aggregation
+            if host_status != Status::Offline {
+                worst_status = Status::aggregate(&[worst_status, host_status]);
+            }
         }
 
         // Use the worst status color as background