v1.0.1 — pv.youtube service preflight + sidecar runtime revert

Two fixes after a 2026-05-23 regression where a Kodi restart left
plugin.video.youtube's service.py un-started, breaking every delegated
play with a silent "Service IPC - Monitor has not started" error.

- Addon: probe pv.youtube's localhost httpd (50152/50153) before
  delegating. If nothing is listening, show a "YouTube service down —
  restart Kodi" notification and fall back to our DASH / progressive
  paths instead of letting setResolvedUrl fail silently.

- Sidecar: revert tokio runtime from current_thread back to
  multi_thread with 2 worker threads so subscriptions_feed's per-channel
  tokio::spawn fan-out runs in parallel. The current_thread RSS savings
  weren't worth the behavioral change.

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="1.0.0"
+       version="1.0.1"
        provider-name="Sulkta-Coop">
   <requires>
     <import addon="xbmc.python" version="3.0.0"/>

addon/plugin.video.torttube/main.py

@@ -442,6 +442,21 @@ def _delegate_to_pv_youtube(yt_id: str) -> bool:
     if delegation succeeded (Kodi will chain-resolve)."""
     if not _pv_youtube_installed():
         return False
+    if not _pv_youtube_service_alive():
+        _log(
+            "pv.youtube installed but service httpd not responding — restart Kodi to recover",
+            xbmc.LOGERROR,
+        )
+        try:
+            xbmcgui.Dialog().notification(
+                "YouTube service down",
+                "Restart Kodi to fix playback",
+                xbmcgui.NOTIFICATION_ERROR,
+                6000,
+            )
+        except Exception:
+            pass
+        return False
     target = f"plugin://plugin.video.youtube/play/?video_id={yt_id}"
     _log(f"delegating playback to plugin.video.youtube: {target}")
     li = xbmcgui.ListItem(label=yt_id)
@@ -462,6 +477,22 @@ def _pv_youtube_installed() -> bool:
         return False
 
 
+def _pv_youtube_service_alive() -> bool:
+    # Their service.py runs an httpd on 50152 (default) for MPD/segment serving.
+    # If it isn't listening, every delegated play silently fails with
+    # "Service IPC - Monitor has not started" in kodi.log and the user just sees
+    # nothing happen. Probe with a 500ms localhost connect — cheap and reliable.
+    # Custom-port users may get a false negative; addon then falls back to its
+    # own paths, so degradation is graceful either way.
+    for port in (50152, 50153):
+        try:
+            with socket.create_connection(("127.0.0.1", port), timeout=0.5):
+                return True
+        except OSError:
+            continue
+    return False
+
+
 def _play(yt_id: str) -> None:
     """Resolve playback in order of preference:
     1. plugin.video.youtube delegation — HD via their proven DASH MPD with