diffusers safetensors stable-diffusion lora template:sd-lora sdxl flash sdxl-flash lightning turbo lcm hyper fast fast-sdxl sd-community text-to-image base_model:fluently/Fluently-XL-v4 base_model:adapter:fluently/Fluently-XL-v4 license:creativeml-openrail-m region:us