feat: add domains, ideas, layouts, widgets API modules

- Add DomainsModule with full CRUD, search, and activity logging
- Add IdeasModule with quick capture endpoint
- Add LayoutsModule for user dashboard layouts
- Add WidgetsModule for widget definitions (read-only)
- Update ActivityService with domain/idea logging methods
- Register all new modules in AppModule

apps/api/src/app.module.ts

@@ -8,6 +8,10 @@ import { ActivityModule } from "./activity/activity.module";
 import { TasksModule } from "./tasks/tasks.module";
 import { EventsModule } from "./events/events.module";
 import { ProjectsModule } from "./projects/projects.module";
+import { DomainsModule } from "./domains/domains.module";
+import { IdeasModule } from "./ideas/ideas.module";
+import { WidgetsModule } from "./widgets/widgets.module";
+import { LayoutsModule } from "./layouts/layouts.module";
 
 @Module({
   imports: [
@@ -18,6 +22,10 @@ import { ProjectsModule } from "./projects/projects.module";
     TasksModule,
     EventsModule,
     ProjectsModule,
+    DomainsModule,
+    IdeasModule,
+    WidgetsModule,
+    LayoutsModule,
   ],
   controllers: [AppController],
   providers: [AppService],