feat(video, settings, docs): add muted playback, nested Settings tabs, merge holidays tab; bump 2025.1.0-alpha.11

API/DB: add Event.muted with full CRUD wiring (Alembic migration), persist/return with autoplay/loop/volume
Dashboard: per‑event video options (autoplay/loop/volume/muted) with system defaults; Settings → Events → Videos defaults
Settings UX: nested tabs with controlled selection; Academic Calendar: merge “Schulferien Import”+“Liste” into “📥 Import & Liste”
Docs: update README and copilot-instructions (video payload, streaming 206, defaults keys); update program-info.json changelog; bump version to 2025.1.0‑alpha.11

server/routes/events.py

@@ -138,7 +138,14 @@ def get_event(event_id):
             "IsAllDay": False,  # Assuming events are not all-day by default
             "MediaId": str(event.event_media_id) if event.event_media_id else None,
             "SlideshowInterval": event.slideshow_interval,
+            "PageProgress": event.page_progress,
+            "AutoProgress": event.auto_progress,
             "WebsiteUrl": event.event_media.url if event.event_media and hasattr(event.event_media, 'url') else None,
+            # Video-specific fields
+            "Autoplay": event.autoplay,
+            "Loop": event.loop,
+            "Volume": event.volume,
+            "Muted": event.muted,
             "RecurrenceRule": event.recurrence_rule,
             "RecurrenceEnd": event.recurrence_end.isoformat() if event.recurrence_end else None,
             "SkipHolidays": event.skip_holidays,
@@ -398,6 +405,7 @@ def create_event():
     autoplay = None
     loop = None
     volume = None
+    muted = None
     if event_type == "video":
         event_media_id = data.get("event_media_id")
         if not event_media_id:
@@ -406,6 +414,7 @@ def create_event():
         autoplay = data.get("autoplay", True)
         loop = data.get("loop", False)
         volume = data.get("volume", 0.8)
+        muted = data.get("muted", False)
 
     # created_by aus den Daten holen, Default: None
     created_by = data.get("created_by")
@@ -435,6 +444,7 @@ def create_event():
     autoplay=autoplay,
     loop=loop,
     volume=volume,
+    muted=muted,
     created_by=created_by,
     # Recurrence
     recurrence_rule=data.get("recurrence_rule"),
@@ -514,6 +524,8 @@ def update_event(event_id):
         event.loop = data.get("loop")
     if "volume" in data:
         event.volume = data.get("volume")
+    if "muted" in data:
+        event.muted = data.get("muted")
     event.created_by = data.get("created_by", event.created_by)
     # Track previous values to decide on exception regeneration
     prev_rule = event.recurrence_rule