Replace CPU-intensive headless Chrome + WebRTC pipeline with a
lightweight Go reverse proxy that strips anti-framing headers
(X-Frame-Options, CSP) and embeds streaming sites in iframes.
- New internal/proxy package with URL rewriting for HTML/CSS
- JS shim injection to intercept fetch/XHR/WebSocket/createElement
- Referer reconstruction for correct cross-origin auth (HLS streams)
- Inline iframe viewer preserving site navigation (not fullscreen overlay)
