Replace Dockerfile and docker-compose.yml with .meal versions, update references

Dockerfile

@@ -1,10 +1,24 @@
-FROM node:latest
-WORKDIR /workdir
+FROM python:3.13-alpine
 
-RUN apt update && \
-	apt install -y git bash docker-cli && \
-	npm install -g --ignore-scripts @earendil-works/pi-coding-agent && \
-	pi install npm:pi-subagents
+WORKDIR /app
 
-COPY * /workdir/
-ENTRYPOINT ["sleep", "infinity"]
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application
+COPY app.py models.py auth.py meals.py ./
+COPY templates/ templates/
+COPY static/ static/
+
+# Create persistent data directory
+RUN mkdir -p /data
+ENV DB_PATH=/data/meals.db
+
+EXPOSE 5000
+
+# Generate a default secret key at build time (override in prod)
+ENV SECRET_KEY=change-me-in-production
+
+# Run in production mode (no debug, use a WSGI server)
+CMD ["flask", "--app", "app:create_app()", "run", "--host=0.0.0.0", "--port=5000"]