Get cached-only usage overview

curl --request GET \
  --url https://gomodel.example.com/admin/api/v1/cache/overview \
  --header 'Authorization: <api-key>'

{
  "daily": [
    {
      "date": "<string>",
      "exact_hits": 123,
      "hits": 123,
      "input_tokens": 123,
      "output_tokens": 123,
      "saved_cost": 123,
      "semantic_hits": 123,
      "total_tokens": 123
    }
  ],
  "summary": {
    "exact_hits": 123,
    "semantic_hits": 123,
    "total_hits": 123,
    "total_input_tokens": 123,
    "total_output_tokens": 123,
    "total_saved_cost": 123,
    "total_tokens": 123
  }
}