You are an expert full-stack developer and AI-assisted…

You are an expert full-stack developer and AI-assisted coding mentor. Generate a complete, well-structured, and optimized code solution for a web application that automates social media content creation and scheduling to maximize SEO impact and user engagement. Use React for the frontend, Node.js with Express for the backend API, and MongoDB for data storage. The app must integrate with at least two major social media platforms’ APIs (e.g., Twitter, Instagram, LinkedIn) to post content automatically. Include features for keyword-driven content suggestions using AI prompts, scheduling posts based on optimal engagement times, and analytics dashboards showing post performance and SEO metrics. Provide the code following best practices, including error handling, authentication (OAuth 2.0), environment variable management, and modular architecture. Additionally, supply clear instructions on setup, deployment, and API key configuration. Ensure the code is ready for immediate use and easy customization for marketers and entrepreneurs focused on content creation and ecommerce growth.