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/web/src/app/(authenticated)/page.tsx

@@ -0,0 +1,48 @@
+import { RecentTasksWidget } from "@/components/dashboard/RecentTasksWidget";
+import { UpcomingEventsWidget } from "@/components/dashboard/UpcomingEventsWidget";
+import { QuickCaptureWidget } from "@/components/dashboard/QuickCaptureWidget";
+import { DomainOverviewWidget } from "@/components/dashboard/DomainOverviewWidget";
+import { mockTasks } from "@/lib/api/tasks";
+import { mockEvents } from "@/lib/api/events";
+
+export default function DashboardPage() {
+  // TODO: Replace with real API call when backend is ready
+  // const { data: tasks, isLoading: tasksLoading } = useQuery({
+  //   queryKey: ["tasks"],
+  //   queryFn: fetchTasks,
+  // });
+  // const { data: events, isLoading: eventsLoading } = useQuery({
+  //   queryKey: ["events"],
+  //   queryFn: fetchEvents,
+  // });
+
+  const tasks = mockTasks;
+  const events = mockEvents;
+  const tasksLoading = false;
+  const eventsLoading = false;
+
+  return (
+    <main className="container mx-auto px-4 py-8">
+      <div className="mb-8">
+        <h1 className="text-3xl font-bold text-gray-900">Dashboard</h1>
+        <p className="text-gray-600 mt-2">
+          Welcome back! Here's your overview
+        </p>
+      </div>
+
+      <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
+        {/* Top row: Domain Overview and Quick Capture */}
+        <div className="lg:col-span-2">
+          <DomainOverviewWidget tasks={tasks} isLoading={tasksLoading} />
+        </div>
+
+        <RecentTasksWidget tasks={tasks} isLoading={tasksLoading} />
+        <UpcomingEventsWidget events={events} isLoading={eventsLoading} />
+
+        <div className="lg:col-span-2">
+          <QuickCaptureWidget />
+        </div>
+      </div>
+    </main>
+  );
+}