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/widgets/widgets.controller.ts

@@ -0,0 +1,39 @@
+import {
+  Controller,
+  Get,
+  Param,
+  UseGuards,
+} from "@nestjs/common";
+import { WidgetsService } from "./widgets.service";
+import { AuthGuard } from "../auth/guards/auth.guard";
+
+/**
+ * Controller for widget definition endpoints
+ * All endpoints require authentication
+ * Provides read-only access to available widget definitions
+ */
+@Controller("widgets")
+@UseGuards(AuthGuard)
+export class WidgetsController {
+  constructor(private readonly widgetsService: WidgetsService) {}
+
+  /**
+   * GET /api/widgets
+   * List all available widget definitions
+   * Returns only active widgets
+   */
+  @Get()
+  async findAll() {
+    return this.widgetsService.findAll();
+  }
+
+  /**
+   * GET /api/widgets/:name
+   * Get a widget definition by name
+   * Useful for fetching widget configuration schemas
+   */
+  @Get(":name")
+  async findByName(@Param("name") name: string) {
+    return this.widgetsService.findByName(name);
+  }
+}

apps/api/src/widgets/widgets.module.ts

@@ -0,0 +1,13 @@
+import { Module } from "@nestjs/common";
+import { WidgetsController } from "./widgets.controller";
+import { WidgetsService } from "./widgets.service";
+import { PrismaModule } from "../prisma/prisma.module";
+import { AuthModule } from "../auth/auth.module";
+
+@Module({
+  imports: [PrismaModule, AuthModule],
+  controllers: [WidgetsController],
+  providers: [WidgetsService],
+  exports: [WidgetsService],
+})
+export class WidgetsModule {}

apps/api/src/widgets/widgets.service.ts

@@ -0,0 +1,59 @@
+import { Injectable, NotFoundException } from "@nestjs/common";
+import { PrismaService } from "../prisma/prisma.service";
+
+/**
+ * Service for managing widget definitions
+ * Provides read-only access to available widget definitions
+ */
+@Injectable()
+export class WidgetsService {
+  constructor(private readonly prisma: PrismaService) {}
+
+  /**
+   * Get all active widget definitions
+   */
+  async findAll() {
+    return this.prisma.widgetDefinition.findMany({
+      where: {
+        isActive: true,
+      },
+      orderBy: {
+        name: "asc",
+      },
+    });
+  }
+
+  /**
+   * Get a widget definition by name
+   */
+  async findByName(name: string) {
+    const widget = await this.prisma.widgetDefinition.findUnique({
+      where: {
+        name,
+      },
+    });
+
+    if (!widget) {
+      throw new NotFoundException(`Widget definition with name '${name}' not found`);
+    }
+
+    return widget;
+  }
+
+  /**
+   * Get a widget definition by ID
+   */
+  async findOne(id: string) {
+    const widget = await this.prisma.widgetDefinition.findUnique({
+      where: {
+        id,
+      },
+    });
+
+    if (!widget) {
+      throw new NotFoundException(`Widget definition with ID ${id} not found`);
+    }
+
+    return widget;
+  }
+}