docs: fix filename typo and add Cloudflare Pages deploy details across docs

docs/architecture/adr/ADR-001.md

@@ -69,7 +69,7 @@ Adopt a **self-managed US-East playout + Cloudflare R2 + edge-cached HLS** archi
 
 ### 3. Frontend
 
-- Static SPA (HTML/CSS/JS + Tailwind + Alpine.js or vanilla) hosted on Cloudflare Pages or same VPS/Nginx.
+- Static SPA (HTML + custom CSS + vanilla JS) hosted on Cloudflare Pages or same VPS/Nginx.
 - Video player: `hls.js` (Chromium/Firefox) or native HLS (Safari). Single live `master.m3u8`.
 - Embedded chat sidebar with room switcher, private DMs, now-playing overlay.