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/tasks/tasks.service.ts

@@ -1,4 +1,5 @@
 import { Injectable, NotFoundException } from "@nestjs/common";
+import { Prisma } from "@prisma/client";
 import { PrismaService } from "../prisma/prisma.service";
 import { ActivityService } from "../activity/activity.service";
 import { TaskStatus, TaskPriority } from "@prisma/client";
@@ -226,7 +227,7 @@ export class TasksService {
 
     // Log activities
     await this.activityService.logTaskUpdated(workspaceId, userId, id, {
-      changes: updateTaskDto,
+      changes: updateTaskDto as Prisma.JsonValue,
     });
 
     // Log completion if status changed to COMPLETED