feat: add WeasyPrint installation to Dockerfile and create startup scripts for Celery and FastAPI

Dockerfile

@@ -20,9 +20,12 @@ RUN --mount=type=cache,target=/root/.cache/uv \
 
 # Then, use a final image without uv
 FROM python:3.11-slim-bookworm
-# It is important to use the image that matches the builder, as the path to the
-# Python executable must be the same, e.g., using `python:3.11-slim-bookworm`
-# will fail.
+
+RUN apt-get update && \
+    apt-get install -y weasyprint && \
+    apt clean && \
+    rm -rf /var/cache/apt/*
+
 
 # Copy the application from the builder
 COPY --from=builder --chown=app:app /app /app