feat(m9/T26a): read-only inheritance resolve service + GetResolvedTemplateMembersCommand

src/ZB.MOM.WW.ScadaBridge.ManagementService/ManagementActor.cs

@@ -244,6 +244,7 @@ public class ManagementActor : ReceiveActor
             UpdateTemplateCommand cmd => await HandleUpdateTemplate(sp, cmd, user.Username),
             DeleteTemplateCommand cmd => await HandleDeleteTemplate(sp, cmd, user.Username),
             ValidateTemplateCommand cmd => await HandleValidateTemplate(sp, cmd),
+            GetResolvedTemplateMembersCommand cmd => await HandleGetResolvedTemplateMembers(sp, cmd),
 
             // Template members
             AddTemplateAttributeCommand cmd => await HandleAddAttribute(sp, cmd, user.Username),
@@ -599,6 +600,20 @@ public class ManagementActor : ReceiveActor
         return validationResult;
     }
 
+    /// <summary>
+    /// Read-only authoring resolve (M9/T26a): returns the effective inherited
+    /// member set for a template — computed fresh from the full inheritance
+    /// chain — plus a staleness summary. Loads every template (children
+    /// eager-loaded) so the resolver can walk an arbitrary-depth chain; never
+    /// mutates stored rows.
+    /// </summary>
+    private static async Task<object?> HandleGetResolvedTemplateMembers(IServiceProvider sp, GetResolvedTemplateMembersCommand cmd)
+    {
+        var repo = sp.GetRequiredService<ITemplateEngineRepository>();
+        var allTemplates = await repo.GetAllTemplatesAsync();
+        return TemplateInheritanceResolver.Resolve(cmd.TemplateId, allTemplates);
+    }
+
     // ========================================================================
     // Template folder handlers
     // ========================================================================