How I Added Pre-Rendering to a Vite Multi-Page App Without SSR

I run RelahConvert, an online file conversion site with 50+ tools across 25 languages. Last week I noticed a problem in my Ahrefs audit: every single one of my 1,449 pages was flagged as "H1 missing" and "Low word count." The pages weren't empty. They had H1s, descriptions, FAQs — all rendering correctly when you visited them. But here's what crawlers were seeing: Yep. Empty. The Setup The site is a Vite MPA (multi-page app), not a SPA. Each tool has its own .html file. Tool-specific...