REFACTOR(repo): simplify project structure

- Move services/nextjs to nextjs/
- Move deploy/docker/Dockerfile.prod to Dockerfile
- Add GitHub Actions workflows (ci.yml, build.yml)
- Remove deploy/, services/, scripts/ folders

nextjs/app/documents/todos/page.tsx

@@ -0,0 +1,12 @@
+'use client'
+
+import { TodoPanel } from '@/widgets/todo'
+
+export default function TodosPage() {
+  return (
+    <div className="h-full flex flex-col">
+      <TodoPanel />
+    </div>
+  )
+}
+