Fix: isolate gradio to /ui path to prevent 500 template error

requirements.txt

@@ -1,6 +1,7 @@
 gradio==4.44.1
 huggingface_hub==0.25.2
 spacy==3.7.5
-fr_core_news_lg @ https://github.com/explosion/spacy-models/releases/download/fr_core_news_lg-3.7.0/fr_core_news_lg-3.7.0-py3-none-any.whl
+en_core_web_sm @ https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.7.1/en_core_web_sm-3.7.1-py3-none-any.whl
 fastapi>=0.111.0
 uvicorn>=0.29.0
+jinja2>=3.1.0