v2: tune playback for bursty upstream + clean overflow handling

- Player: match webplayer.online's proven mpegts.js live-sync config
  (deep 30-90s buffer, 45s target latency, 1.1x catch-up). The upstream
  delivers in bursts with multi-second gaps (measured up to ~6s); the
  deep buffer rides over them so 4K HEVC plays smoothly.
- Hub: on subscriber buffer overflow, cleanly disconnect the client so
  it reconnects and resyncs from a TS packet boundary instead of
  dropping bytes mid-stream (which corrupted alignment / sync_byte).
- Enlarge per-client buffer (256 -> 2048 chunks).
- Refresh real1.m3u from upstream.

frontend/src/components/Player.tsx

@@ -83,8 +83,13 @@ export default function Player({ live, streamKey }: Props) {
       }, 5000);
     };
 
+
+
     function start() {
       destroyPlayer();
+      // Config mirrors webplayer.online (proven on this exact bursty upstream):
+      // a deep 30-90s live buffer absorbs the upstream's multi-second delivery
+      // gaps, while gentle 1.1x catch-up keeps latency bounded.
       const player = mpegts.createPlayer(
         { type: "mpegts", isLive: true, url: src },
         {
@@ -96,7 +101,11 @@ export default function Player({ live, streamKey }: Props) {
           liveSyncTargetLatency: 45,
           liveSyncPlaybackRate: 1.1,
           liveBufferLatencyChasing: true,
+          liveBufferLatencyMaxLatency: 90,
+          liveBufferLatencyMinRemain: 30,
           autoCleanupSourceBuffer: true,
+          autoCleanupMaxBackwardDuration: 120,
+          autoCleanupMinBackwardDuration: 90,
           fixAudioTimestampGap: true,
           lazyLoad: false,
         }