DASH HD playback — WIP behind TORTTUBE_DASH=1 + upstream notes

Sidecar resolve_dash op shipped — returns rustypipe's full video_only_streams
+ audio_streams (16+ representations for NGGYU, from 360p H.264 through 4K
AV1). Addon _build_dash_mpd assembles a valid on-demand MPEG-DASH manifest
filtered to H.264 ≤1080p + best AAC audio.

Two unblocked-by-WIP issues surfaced during integration:
- inputstream.adaptive's libcurl can't open file:// URLs (logged in
  docs/upstream.md as an enhancement-target).
- Rapid Player.Open retries can trigger Kodi's 'two concurrent
  busydialogs' fatal exit; need lifecycle hardening before re-enabling.

Pivoted to localhost HTTP-server serving (ThreadingHTTPServer on a
port-0 socket, MPD bytes captured in a per-instance handler subclass).
Lifecycle: server.shutdown() runs in a finally block after the
SponsorBlockMonitor watcher exits. Works in isolation but Kodi crashed
under rapid retry conditions — needs more testing.

For v0.0.5: DASH path is gated behind TORTTUBE_DASH=1 env var; default
falls through to the stable yt-dlp progressive 360p path that's been
verified live. M7 milestone added to track the remaining work; PRs
to inputstream.adaptive + Kodi candidates logged in docs/upstream.md.

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="0.0.2"
+       version="0.0.5"
        provider-name="Sulkta">
   <requires>
     <import addon="xbmc.python" version="3.0.0"/>