Apply validation feedback for uv lock and dependency docs

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Co-authored-by: dsaub <54474838+dsaub@users.noreply.github.com>

Dockerfile

@@ -5,6 +5,7 @@ ENV PYTHONUNBUFFERED=1
 WORKDIR /app
 
 COPY pyproject.toml /app/
+COPY uv.lock /app/
 RUN apk --no-cache update && apk --no-cache upgrade
 RUN pip install --no-cache-dir uv
 RUN uv sync --no-dev --no-install-project

pyproject.toml

@@ -7,6 +7,7 @@ dependencies = [
     "Django==6.0.5",
     "django-compressor==4.6.0",
     "django-redis==6.0.0",
+    # S3 backend requerido por tienda/storage_backends.py cuando S3_ENABLE=True.
     "django-storages[s3]==1.14.6",
     "fpdf2==2.8.7",
     "gunicorn==26.0.0",