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/domains/domains.controller.ts

@@ -0,0 +1,104 @@
+import {
+  Controller,
+  Get,
+  Post,
+  Patch,
+  Delete,
+  Body,
+  Param,
+  Query,
+  UseGuards,
+  Request,
+  UnauthorizedException,
+} from "@nestjs/common";
+import { DomainsService } from "./domains.service";
+import { CreateDomainDto, UpdateDomainDto, QueryDomainsDto } from "./dto";
+import { AuthGuard } from "../auth/guards/auth.guard";
+
+/**
+ * Controller for domain endpoints
+ * All endpoints require authentication
+ */
+@Controller("domains")
+@UseGuards(AuthGuard)
+export class DomainsController {
+  constructor(private readonly domainsService: DomainsService) {}
+
+  /**
+   * POST /api/domains
+   * Create a new domain
+   */
+  @Post()
+  async create(@Body() createDomainDto: CreateDomainDto, @Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.domainsService.create(workspaceId, userId, createDomainDto);
+  }
+
+  /**
+   * GET /api/domains
+   * Get paginated domains with optional filters
+   */
+  @Get()
+  async findAll(@Query() query: QueryDomainsDto, @Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    if (!workspaceId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+    return this.domainsService.findAll({ ...query, workspaceId });
+  }
+
+  /**
+   * GET /api/domains/:id
+   * Get a single domain by ID
+   */
+  @Get(":id")
+  async findOne(@Param("id") id: string, @Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    if (!workspaceId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+    return this.domainsService.findOne(id, workspaceId);
+  }
+
+  /**
+   * PATCH /api/domains/:id
+   * Update a domain
+   */
+  @Patch(":id")
+  async update(
+    @Param("id") id: string,
+    @Body() updateDomainDto: UpdateDomainDto,
+    @Request() req: any
+  ) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.domainsService.update(id, workspaceId, userId, updateDomainDto);
+  }
+
+  /**
+   * DELETE /api/domains/:id
+   * Delete a domain
+   */
+  @Delete(":id")
+  async remove(@Param("id") id: string, @Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.domainsService.remove(id, workspaceId, userId);
+  }
+}