Live Demo Iframe Embed

Added a "live demo" tab to the project detail view that automatically detects embeddable URLs (netlify.app, vercel.app, github.io, etc.) from the project's link field and renders them in a sandboxed iframe. No manual configuration needed — if the link points to a deployed web app, the tab appears. If it's a GitHub repo, video, or non-embeddable URL, it stays as a regular link. Embed height is configurable per project via the admin form.