🔒 feat: RBAC for Multi-Convo Feature (#3964)

* fix: remove duplicate keys in German language translations

* wip: multi-convo role permissions

* ci: Update loadDefaultInterface tests due to MULTI_CONVO

* ci: update Role.spec.js with tests for MULTI_CONVO permission type

* fix: Update ContentParts component to handle undefined content array

* feat: render Multi-Convo based on UI permissions

api/models/schema/roleSchema.js

@@ -42,6 +42,12 @@ const roleSchema = new mongoose.Schema({
       default: true,
     },
   },
+  [PermissionTypes.MULTI_CONVO]: {
+    [Permissions.USE]: {
+      type: Boolean,
+      default: true,
+    },
+  },
 });
 
 const Role = mongoose.model('Role', roleSchema);