Upload media for agent

curl --request POST \
  --url http://localhost:3000/api/media/{agentId}/upload-media \
  --header 'Content-Type: multipart/form-data'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "url": "<string>",
  "type": "image",
  "mimeType": "<string>",
  "size": 123
}