M7 — DASH partial: MPD serves OK, segment alignment still WIP

Big strides today:
- Sidecar resolve_dash op works (verified live on Pi)
- MPD builder generates valid MPEG-DASH on-demand manifest with
  H.264 720p/1080p video reps + best AAC audio rep
- ThreadingHTTPServer serves the MPD over the LAN IP (not 127.0.0.1
  — curl in Kodi 20's inputstream.adaptive can't open that)
- inputstream.adaptive PARSES our manifest cleanly: 'Successfully
  parsed manifest file (Periods: 1, Streams in first period: 2)'
- Segment GETs work once we set stream_headers with User-Agent
  + Origin + Referer (otherwise googlevideo 403s the audio segments)

Remaining issue:
- Audio drifts -25s → -44s behind video within seconds of playback
  start. inputstream.adaptive needs explicit SegmentTimeline timing
  derived from each rep's sidx box to stay aligned. Plugin.video.youtube
  does this; we'd need to fetch+parse sidx ourselves or fork their
  MPD-builder. Documented as M7-blocking + upstream PR candidate.

Default remains the stable yt-dlp progressive 360p path. DASH is
behind dash_enabled setting OR a dash.on marker file in addon_data.
Toggle on via:
  ssh <kodi> 'touch /storage/.kodi/userdata/addon_data/plugin.video.torttube/dash.on'
Toggle off:
  ssh <kodi> 'rm /storage/.kodi/userdata/addon_data/plugin.video.torttube/dash.on'

Addon v0.0.10. docs/upstream.md has the full segment-timing analysis.

addon/plugin.video.torttube/addon.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <addon id="plugin.video.torttube"
        name="torttube"
-       version="0.0.9"
+       version="0.0.10"
        provider-name="Sulkta-Coop">
   <requires>
     <import addon="xbmc.python" version="3.0.0"/>