fix: add missing physicalDisks handler to WebSocket store (addresses #429)

The disk monitoring backend was working but frontend wasn't updating because the WebSocket store was missing the handler for physicalDisks data. Also added physicalDisks count to broadcast logging for better debugging.

frontend-modern/src/stores/websocket.ts

@@ -163,6 +163,7 @@ export function createWebSocketStore(url: string) {
               if (message.data.performance !== undefined) setState('performance', message.data.performance);
               if (message.data.connectionHealth !== undefined) setState('connectionHealth', message.data.connectionHealth);
               if (message.data.stats !== undefined) setState('stats', message.data.stats);
+              if (message.data.physicalDisks !== undefined) setState('physicalDisks', message.data.physicalDisks);
               // Sync active alerts from state
               if (message.data.activeAlerts !== undefined) {
                 // Received activeAlerts update

internal/monitoring/monitor.go

@@ -481,6 +481,7 @@ func (m *Monitor) Start(ctx context.Context, wsHub *websocket.Hub) {
 				Int("containers", len(state.Containers)).
 				Int("pbs", len(state.PBSInstances)).
 				Int("pbsBackups", len(state.PBSBackups)).
+				Int("physicalDisks", len(state.PhysicalDisks)).
 				Msg("Broadcasting state update (ticker)")
 			wsHub.BroadcastState(state)