feat: add CLI debug snapshot command for one-shot instance state inspection

Adds `debug snapshot --id <int>` to query a running instance's current
attribute values and alarm states without the subscribe/stream overhead
of the debug view. Routes through ManagementActor → CommunicationService
→ site DeploymentManager → InstanceActor using the existing remote query
pattern.

Component-CLI.md

@@ -169,6 +169,11 @@ scadalink health event-log --site-identifier <site-id> [--from <date>] [--to <da
 scadalink health parked-messages --site-identifier <site-id> [--page <n>] [--page-size <n>] [--format json|table]
 ```
 
+### Debug Commands
+```
+scadalink debug snapshot --id <id> [--format json|table]
+```
+
 ### Shared Script Commands
 ```
 scadalink shared-script list [--format json|table]