Unified search across documents and memories

curl --request GET \
  --url https://api.example.com/api/search/unified \
  --header 'Authorization: Bearer <token>'

{
  "documents": [
    {
      "document": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "title": "<string>",
        "tags": [
          "<string>"
        ],
        "source_type": "<string>",
        "updated_at": "2023-11-07T05:31:56Z",
        "folder_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
      },
      "score": 123,
      "snippet": "<string>"
    }
  ],
  "memories": [
    {
      "id": 123,
      "topic": "<string>",
      "content": "<string>",
      "memory_type": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "scope": "<string>",
      "source": "<string>"
    }
  ],
  "query": "<string>"
}