feat(stablediffusion-ggml): add support to ref images (flux Kontext)

[mudler]

Description

Testing with:

curl http://localhost:8080/v1/images/generations -H "Content-Type: application/json" -d '{
  "model": "flux.1-kontext-dev",
  "prompt": "change 'flux.cpp' to 'kontext.cpp'",
  "size": "256x256",
  "ref_images": [
  	"https://raw.githubusercontent.com/leejet/stable-diffusion.cpp/master/assets/flux/flux1-dev-q8_0.png"
  ]
}'

Install with:

local-ai run flux.1-kontext-dev

Otherwise to install manually, place the model downloaded in the model folder, use a config similar to:

backend: stablediffusion-ggml
cfg_scale: 1
name: flux.1-kontext-dev
options:
- diffusion_model
- clip_l_path:clip_l.safetensors
- t5xxl_path:t5xxl_fp16.safetensors
- vae_path:ae.safetensors
- sampler:euler
parameters:
  model: flux1-kontext-dev-Q8_0.gguf
step: 25

Notes for Reviewers

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