v2: mpegts.js + single-upstream fan-out hub (no FFmpeg/HLS)

Replaces the FFmpeg -> MediaMTX -> HLS pipeline with a raw MPEG-TS
fan-out architecture:

- Go stream.Hub holds ONE upstream connection per active channel and
  broadcasts the raw TS bytes to all connected browsers via /ts.
  The IPTV provider only ever sees one IP (the server), no matter how
  many viewers are watching (shared single-channel model).
- Frontend uses mpegts.js to play the raw TS in-browser via MSE,
  fixing HEVC/H.265 4K streams that HLS could not package.
- Dropped FFmpeg, MediaMTX, RTMP/RTSP, HLS proxy, playback/ingest
  modes, the OBS source toggle, and FFmpeg health stats.
- UI look preserved (fullscreen video, collapsible sidebar, status
  bar, upstream-down banner, hourly playlist auto-refresh).

Tradeoff: loses iOS Safari (no MSE/mpegts.js); fixes desktop/Android
playback of both H.264 and H.265.

frontend/src/components/StatusBar.tsx

@@ -4,22 +4,6 @@ interface Props {
   status: StreamStatus | null;
 }
 
-function healthColor(speed: string): string {
-  const n = parseFloat(speed);
-  if (isNaN(n)) return "health-unknown";
-  if (n >= 0.95) return "health-good";
-  if (n >= 0.8) return "health-warn";
-  return "health-bad";
-}
-
-function healthLabel(speed: string): string {
-  const n = parseFloat(speed);
-  if (isNaN(n)) return "?";
-  if (n >= 0.95) return "Good";
-  if (n >= 0.8) return "Slow upstream";
-  return "Upstream too slow";
-}
-
 export default function StatusBar({ status }: Props) {
   if (!status) {
     return (
@@ -30,19 +14,13 @@ export default function StatusBar({ status }: Props) {
     );
   }
 
-  const h = status.health;
-
   return (
     <div className="status-bar">
       <span className={`status-dot ${status.live ? "live" : "offline"}`} />
       <span className="status-text">
         {status.live ? "LIVE" : "Offline"}
       </span>
-      <span className="status-separator">|</span>
-      <span className="status-source">
-        Source: {status.source === "obs" ? "OBS" : "IPTV"}
-      </span>
-      {status.source === "iptv" && status.channel_name && (
+      {status.channel_name && (
         <>
           <span className="status-separator">|</span>
           <span className={`status-channel ${status.transitioning ? "channel-transitioning" : ""}`}>
@@ -59,21 +37,6 @@ export default function StatusBar({ status }: Props) {
           <span className="upstream-down-banner">Upstream down?</span>
         </>
       )}
-      {h && h.speed && (
-        <span className="status-health">
-          <span className="status-separator">|</span>
-          <span className={`health-indicator ${healthColor(h.speed)}`}>
-            {healthLabel(h.speed)}
-          </span>
-          <span className="health-stats">
-            {h.speed} / {h.bitrate}
-            {h.fps && h.fps !== "0.00" && <> / {h.fps}fps</>}
-            {h.drop_frames !== "0" && (
-              <span className="health-drops"> / {h.drop_frames} dropped</span>
-            )}
-          </span>
-        </span>
-      )}
     </div>
   );
 }