fixing app

Refactor app.py to remove model caching and initialize model per request. Update root endpoint and modify predict function to handle uploaded images. Change test.py to use variable for local app URL.

Implement model caching in app.py and initialize default model at startup. Update test.py to use variable for app URL.

Refactor model loading in app.py to create a models directory and update local model path. Modify test.py to change default model ID and use a variable for the local app URL.

init