Update Dockerfile

Dockerfile

@@ -2,18 +2,14 @@
 # This file tells Hugging Face Spaces how to build and run the Flask application.
 
 # 1. Start with a standard Python 3.9 base image.
-FROM python:3.13-slim
+FROM python:3.9-slim
 
 # 2. Set the working directory inside the container.
 WORKDIR /code
 
-# 3. Set environment variables.
+# 3. Set the HF_HOME environment variable to a writable directory.
 # This prevents the /.cache permission error.
 ENV HF_HOME="/tmp/.cache/huggingface"
-# --- FIX ---
-# This explicitly tells Flask which file contains the application.
-# This is a more robust way to ensure routes are found.
-ENV FLASK_APP=app.py
 
 # 4. Copy the requirements file into the working directory.
 COPY ./requirements.txt /code/requirements.txt
@@ -27,6 +23,7 @@ COPY ./ /code/
 # 7. Expose the port that the application will run on.
 EXPOSE 7860
 
-# 8. Define the command to run the application using Flask's built-in server for debugging.
-# The FLASK_APP environment variable set above will ensure this command finds the right file.
-CMD ["flask", "run", "--host=0.0.0.0", "--port=7860"]
+# 8. Define the command to run the application using Gunicorn (production standard).
+# This is more robust than `flask run` and explicitly points to the 'app' object
+# within the 'app.py' module, which should solve the route discovery issue.
+CMD ["gunicorn", "--bind", "0.0.0.0:7860", "app:app"]