Tissue segmentation

curl --request POST \
  --url http://localhost:8080/api/predict/tissue-seg \
  --header 'Content-Type: application/json' \
  --data '
{
  "image_data": "<base64-png-512x512>",
  "slide_name": "slide_A",
  "x": 0,
  "y": 0,
  "width": 512,
  "height": 512,
  "tissue_ratio": null,
  "patch_idx": 0,
  "resolution": 8
}
'

{
  "output": [
    123
  ],
  "slide_name": "<string>",
  "x": 123,
  "y": 123,
  "width": 123,
  "height": 123,
  "tissue_ratio": 123,
  "patch_idx": 123,
  "resolution": 123
}