feat: Release version 1.3.1 with Docker optimization and comprehensive documentation

- Update version to 1.3.1 in package.json and docker-compose.yml
- Optimize Dockerfile with proper data directory structure for production
- Add comprehensive Docker documentation (DOCKER.md)
- Include deployment and backup scripts (deploy.sh, backup.sh)
- Add .env.example for environment configuration
- Improve README with detailed deployment instructions
- Fix database path handling for Docker production environment
- Add health checks and proper Docker Compose configuration
- Remove development task documentation
- Update .gitignore to exclude backup directories

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -16,9 +16,10 @@ RUN npm ci --omit=dev && npm cache clean --force
 # 6. Copiar el resto de la aplicación
 COPY . .
 
-# 7. Crear usuario no root y darle permisos
-RUN addgroup -S app && adduser -S app -G app \
-    && chown -R app:app /app
+# 7. Crear directorio para la base de datos y usuario no root
+RUN mkdir -p /app/data && \
+    addgroup -S app && adduser -S app -G app && \
+    chown -R app:app /app
 USER app
 
 # 8. Exponer el puerto