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/layouts/layouts.controller.ts

@@ -0,0 +1,128 @@
+import {
+  Controller,
+  Get,
+  Post,
+  Patch,
+  Delete,
+  Body,
+  Param,
+  UseGuards,
+  Request,
+  UnauthorizedException,
+} from "@nestjs/common";
+import { LayoutsService } from "./layouts.service";
+import { CreateLayoutDto, UpdateLayoutDto } from "./dto";
+import { AuthGuard } from "../auth/guards/auth.guard";
+
+/**
+ * Controller for user layout endpoints
+ * All endpoints require authentication
+ */
+@Controller("layouts")
+@UseGuards(AuthGuard)
+export class LayoutsController {
+  constructor(private readonly layoutsService: LayoutsService) {}
+
+  /**
+   * GET /api/layouts
+   * Get all layouts for the authenticated user
+   */
+  @Get()
+  async findAll(@Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.layoutsService.findAll(workspaceId, userId);
+  }
+
+  /**
+   * GET /api/layouts/:id
+   * Get a single layout by ID
+   */
+  @Get(":id")
+  async findOne(@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.layoutsService.findOne(id, workspaceId, userId);
+  }
+
+  /**
+   * GET /api/layouts/default
+   * Get the default layout for the authenticated user
+   * Falls back to the most recently created layout if no default exists
+   */
+  @Get("default")
+  async findDefault(@Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.layoutsService.findDefault(workspaceId, userId);
+  }
+
+  /**
+   * POST /api/layouts
+   * Create a new layout
+   * If isDefault is true, any existing default layout will be unset
+   */
+  @Post()
+  async create(@Body() createLayoutDto: CreateLayoutDto, @Request() req: any) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.layoutsService.create(workspaceId, userId, createLayoutDto);
+  }
+
+  /**
+   * PATCH /api/layouts/:id
+   * Update a layout
+   * If isDefault is set to true, any existing default layout will be unset
+   */
+  @Patch(":id")
+  async update(
+    @Param("id") id: string,
+    @Body() updateLayoutDto: UpdateLayoutDto,
+    @Request() req: any
+  ) {
+    const workspaceId = req.user?.workspaceId;
+    const userId = req.user?.id;
+
+    if (!workspaceId || !userId) {
+      throw new UnauthorizedException("Authentication required");
+    }
+
+    return this.layoutsService.update(id, workspaceId, userId, updateLayoutDto);
+  }
+
+  /**
+   * DELETE /api/layouts/:id
+   * Delete a layout
+   */
+  @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.layoutsService.remove(id, workspaceId, userId);
+  }
+}