Update app.py

Add image similarity mode using forward_embedding FEATURE_DIM descriptors

Replace plot PCA with user-configurable colour blend per PC channel

Add dual PCA modes: full rainbow and plot rainbow

Upsample PCA to model input resolution, add download button

Fix image dict handling, restore original UI, remove .opencode from repo

Convert app.py to gradio.Server with custom FastAPI routes and @gradio/client frontend

Update app.py

Update app.py

Convert gradio blocks to server and implement Lodestones tagger-experiment