Add meal tracker app: Flask + SQLite with auth, dashboard, 31 passing tests, Docker Compose

Dockerfile.meal

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+FROM python:3.13-alpine
+
+WORKDIR /app
+
+# 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"]