feat(daemon): Add UPSD (NUT) protocol support, Proxmox VM shutdown action, pause/resume monitoring, and network-loss/unreachable handling; bump config version to 4.2

ts/actions/shutdown-action.ts

@@ -34,10 +34,17 @@ export class ShutdownAction extends Action {
 
     // CRITICAL SAFETY CHECK: Shutdown should NEVER trigger unless UPS is on battery
     // A low battery while on grid power is not an emergency (the battery is charging)
+    // When UPS is unreachable, we don't know the actual state - don't trigger false shutdown
     if (context.powerStatus !== 'onBattery') {
-      logger.info(
-        `Shutdown action skipped: UPS is not on battery (status: ${context.powerStatus})`,
-      );
+      if (context.powerStatus === 'unreachable') {
+        logger.info(
+          `Shutdown action skipped: UPS is unreachable (communication failure, actual state unknown)`,
+        );
+      } else {
+        logger.info(
+          `Shutdown action skipped: UPS is not on battery (status: ${context.powerStatus})`,
+        );
+      }
       return false;
     }