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/activity/interfaces/activity.interface.ts

@@ -9,7 +9,7 @@ export interface CreateActivityLogInput {
   action: ActivityAction;
   entityType: EntityType;
   entityId: string;
-  details?: Record<string, any>;
+  details?: Prisma.JsonValue;
   ipAddress?: string;
   userAgent?: string;
 }