fix(opcua): equipment-tag planner diff + folder-scoped NodeIds (review findings)

Two bundle-review fixes + idempotency coverage:
- CRITICAL: the planner ignored EquipmentTags, so an incremental deploy changing only
  equipment tags produced an empty plan and HandleRebuild short-circuited before
  materialising them. Add TagId to EquipmentTagPlan + Added/Removed/ChangedEquipmentTags
  to Phase7Plan (diffed by TagId, in IsEmpty, driving Apply's needsRebuild) — mirroring
  the GalaxyTags treatment.
- IMPORTANT: equipment variable NodeId was the raw driver FullName, which collides across
  identical machines (e.g. two PLCs both exposing register 40001) — the second variable
  was silently dropped. NodeId is now folder-scoped (parent/Name); FullName stays on
  EquipmentTagPlan for the later values-routing milestone.
- Task 4: SDK-backed idempotency test (double-apply -> single variable); restart-safety
  confirmed (RestoreApplied reuses the same RebuildAddressSpace -> HandleRebuild path).
- Minor: align composer equipment-tag sort with the artifact decoder (coalesce FolderPath).

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Drivers/DeploymentArtifact.cs

@@ -262,6 +262,7 @@ public static class DeploymentArtifact
             var equipmentId = eqEl.GetString();
             if (string.IsNullOrWhiteSpace(equipmentId)) continue;
 
+            var tagId = el.TryGetProperty("TagId", out var tidEl) ? tidEl.GetString() : null;
             var di = el.TryGetProperty("DriverInstanceId", out var diEl) ? diEl.GetString() : null;
             var name = el.TryGetProperty("Name", out var nmEl) ? nmEl.GetString() : null;
             var folder = el.TryGetProperty("FolderPath", out var fpEl) && fpEl.ValueKind != JsonValueKind.Null
@@ -270,11 +271,12 @@ public static class DeploymentArtifact
             var tagConfig = el.TryGetProperty("TagConfig", out var tcEl) && tcEl.ValueKind == JsonValueKind.String
                 ? tcEl.GetString() : null;
 
-            if (string.IsNullOrWhiteSpace(di) || string.IsNullOrWhiteSpace(name)) continue;
+            if (string.IsNullOrWhiteSpace(tagId) || string.IsNullOrWhiteSpace(di) || string.IsNullOrWhiteSpace(name)) continue;
             if (!driverToNamespace.TryGetValue(di!, out var nsId)) continue;
             if (!equipmentNamespaces.Contains(nsId)) continue;
 
             result.Add(new EquipmentTagPlan(
+                TagId: tagId!,
                 EquipmentId: equipmentId!,
                 DriverInstanceId: di!,
                 FolderPath: folder ?? string.Empty,