* Synchronous disk I/O using `fs.appendFileSync` in the email handler will severely block the Node.js event loop, crippling API scalability. * Hardcoded Google Drive links in `src/utils/courseLinks.js` fatally compromise paid digital asset security and access control integrity. * The Vercel API endpoint utilizes overly permissive `Access-Control-Allow-Origin: *`, unnecessarily broadening the exposed attack surface given the zero security score. * The serverless architecture is incorrectly implemented by relying on volatile, relative local file storage instead of persistent cloud database solutions. * Refactor the massive 13KB `About.js` component to improve modularity, reducing bundle complexity and enhancing long-term component maintainability.
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