feat: add ZFS monitoring (#2209)

- track pool capacity, health, I/O, scrub status, and vdev errors
- report dataset usage and correct ZFS filesystem metrics
- add pool charts, detail views, refresh controls, and health alerts
- persist pool details and include ZFS usage in disk alerts
- support configurable detail intervals and legacy agent compatibility

---------

Co-authored-by: hank <hank@henrygd.me>

internal/hub/collections.go

@@ -91,6 +91,12 @@ func setCollectionAuthSettings(app core.App) error {
 	}); err != nil {
 		return err
 	}
+	if err := applyCollectionRules(app, []string{"zfs_pools"}, collectionRules{
+		list: &systemScopedReadRule,
+		view: &systemScopedReadRule,
+	}); err != nil {
+		return err
+	}
 
 	if err := applyCollectionRules(app, []string{"fingerprints"}, collectionRules{
 		list:   &systemScopedReadRule,