VynodeIPTV 0.9.1 — Portrait fullscreen

Improves the browser player's portrait fullscreen behavior:

• Shows the entire video frame instead of cropping a widescreen broadcast into portrait.
• Uses black letterboxing, dynamic viewport height and safe-area-aware return controls.
• Prevents the guide behind fullscreen from scrolling.
• Two-stream portrait walls stack vertically; six streams use two columns.
• Return button describes the actual destination: wall or guide. Streams remain running when returning.

Update Unraid's ghcr.io/minerport/vynodeiptv:latest container (or pin :0.9.1), then reload the browser. Android remains 0.9.0; no APK update needed.

Verified with a synthetic stream at 390x844 and 844x390, plus the JavaScript suite and container release checks. Physical phone/OS fullscreen behavior remains an acceptance item.