perf: faster stream startup

- Stop sending no-store on vendored player libraries: hls.min.js and
  mpegts.min.js (~750 KB) were re-downloaded on every player open
- hls.js: start with 1 live segment instead of 3, lower buffer-first
  threshold 1.5s -> 0.8s, poll buffer every 100ms
- mpegts.js: initial stash 512KB -> 128KB, start at 0.5s buffered
- Live FFmpeg: -hls_init_time 1 closes the first segment after ~1s

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/player.html

@@ -264,7 +264,7 @@
                 nudgeOffset: 0.8, // More aggressive jump over corrupted frames
                 nudgeMaxRetries: 30,
                 maxLiveSyncPlaybackRate: 1.1, // Slower catch-up to avoid chaos
-                initialLiveManifestSize: 3, // Wait for more segments before starting
+                initialLiveManifestSize: 1, // Start as soon as one segment exists
                 abrEwmaDefaultEstimate: 1000000,
                 manifestLoadingRetryDelay: 1000,
                 levelLoadingRetryDelay: 1000
@@ -286,12 +286,12 @@
                 const checkBuffer = setInterval(() => {
                     if (video.buffered.length > 0) {
                         const bufferEnd = video.buffered.end(0);
-                        if (bufferEnd > 1.5) { // 1.5s buffer-first
+                        if (bufferEnd > 0.8) { // Start fast, hls.js keeps buffering
                             clearInterval(checkBuffer);
                             video.play().catch(() => playOverlay.style.display = 'flex');
                         }
                     }
-                }, 200);
+                }, 100);
             });
             hls.on(Hls.Events.LEVEL_LOADED, (e, d) => {
                 if (d.details && d.details.totalduration > injectedDuration) window.currentHlsDuration = d.details.totalduration;