T1/Phase 1: scaffold Vite SPA + Hono API + Bun worker

- apps/web: Vite + React 19 + TanStack Router/Query + shadcn/ui
   - apps/api: Hono + Bun on :3001 with /api/health, /api/auth/*, /mcp stubs
   - apps/worker: Bun worker stub, DB connection, graceful SIGTERM
   - apps/web-legacy/: old Next.js code moved aside (preserved for T2-T8 reference)
   - Dockerfiles: api (Bun), worker (Bun), spa (multi-stage Caddy)
   - Caddyfile: serves dist + reverse-proxies /api/* + /mcp to api
   - docker-compose.yml: 4-service target (api, spa, db, worker)
   - packages/db/src/client.ts: shared Drizzle client for api + worker
   - db/client.ts: root-level alias for convenience

   Parent: t_e1cbd87d -> t_24c9c3fd (T0)

apps/web-legacy/components/dashboard/widgets/recent-activity-widget.tsx

@@ -0,0 +1,22 @@
+'use client';
+
+import { Activity } from 'lucide-react';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+
+export function RecentActivityWidget() {
+  return (
+    <Card className="h-full border-0 shadow-none">
+      <CardHeader className="p-0 pb-3">
+        <CardTitle className="flex items-center gap-2 text-base">
+          <Activity className="h-4 w-4" aria-hidden="true" />
+          Recent Activity
+        </CardTitle>
+      </CardHeader>
+      <CardContent className="p-0">
+        <p className="text-sm text-muted-foreground">
+          Activity feed coming soon
+        </p>
+      </CardContent>
+    </Card>
+  );
+}