Add DreamSim (human-aligned) encoder: LoRA-tuned DINO ViT-B/16 patch tokens + CLS attention

use latest gradio (6.19) compatible with py3.13 env; sdk_version match

re-add gradio==4.44.1 (was uninstalled); align sdk_version

deps: drop gradio from requirements (let SDK manage), CPU torch, transformers>=4.53; add startup prints

DINO Hierarchies Gradio app: upload image -> condensed tree + reveal