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/components/dashboard/QuickCaptureWidget.tsx

@@ -0,0 +1,55 @@
+"use client";
+
+import { useState } from "react";
+import { Button } from "@mosaic/ui";
+import { useRouter } from "next/navigation";
+
+export function QuickCaptureWidget() {
+  const [idea, setIdea] = useState("");
+  const router = useRouter();
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    if (!idea.trim()) return;
+
+    // TODO: Implement quick capture API call
+    // For now, just show a success indicator
+    console.log("Quick capture:", idea);
+    setIdea("");
+  };
+
+  const goToTasks = () => {
+    router.push("/tasks");
+  };
+
+  return (
+    <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-6">
+      <h2 className="text-lg font-semibold text-gray-900 mb-4">Quick Capture</h2>
+      <p className="text-sm text-gray-600 mb-4">
+        Quickly jot down ideas or brain dumps
+      </p>
+      <form onSubmit={handleSubmit} className="space-y-3">
+        <textarea
+          value={idea}
+          onChange={(e) => setIdea(e.target.value)}
+          placeholder="What's on your mind?"
+          className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none"
+          rows={3}
+        />
+        <div className="flex gap-2">
+          <Button type="submit" variant="primary" size="sm">
+            Save Note
+          </Button>
+          <Button
+            type="button"
+            variant="secondary"
+            size="sm"
+            onClick={goToTasks}
+          >
+            Create Task
+          </Button>
+        </div>
+      </form>
+    </div>
+  );
+}