TOC, orientation page, overview, and redirect updates for migrated media playback articles

Excludes PlayReady articles (adaptive-streaming-with-playready.md and
hardware-drm.md) from migration - these remain in the UWP section and are
removed from the WinUI section instead.

- Deletes 11 migrated UWP files (excludes 2 PlayReady articles)
- Removes 3 PlayReady files from WinUI dir (hardware-drm, adaptive-streaming-with-playready, playready-client-sdk)
- Adds 11 redirects from UWP to WinUI paths
- Updates WinUI TOC with 11 articles + overview
- Updates UWP TOC to keep PlayReady DRM subtree intact
- Updates UWP orientation page with relocation note and updated links
- Creates WinUI overview page without PlayReady entries
- Fixes broken link to background-audio.md in adaptive-streaming.md

Co-authored-by: Copilot <[email protected]>

Author: drewbatgit

.openpublishing.redirection.json

@@ -10584,6 +10584,61 @@
       "source_path": "hub/apps/windows-app-sdk/stable-channel.md",
       "redirect_url": "/windows/windows-app-sdk/release-channels",
       "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/play-audio-and-video-with-mediaplayer.md",
+      "redirect_url": "/windows/apps/develop/media-playback/play-audio-and-video-with-mediaplayer",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/media-playback-with-mediasource.md",
+      "redirect_url": "/windows/apps/develop/media-playback/media-playback-with-mediasource",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/integrate-with-systemmediatransportcontrols.md",
+      "redirect_url": "/windows/apps/develop/media-playback/integrate-with-systemmediatransportcontrols",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/system-media-transport-controls.md",
+      "redirect_url": "/windows/apps/develop/media-playback/system-media-transport-controls",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/system-supported-metadata-cues.md",
+      "redirect_url": "/windows/apps/develop/media-playback/system-supported-metadata-cues",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/create-schedule-and-manage-media-breaks.md",
+      "redirect_url": "/windows/apps/develop/media-playback/create-schedule-and-manage-media-breaks",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/adaptive-streaming.md",
+      "redirect_url": "/windows/apps/develop/media-playback/adaptive-streaming",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/hls-tag-support.md",
+      "redirect_url": "/windows/apps/develop/media-playback/hls-tag-support",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/dash-profile-support.md",
+      "redirect_url": "/windows/apps/develop/media-playback/dash-profile-support",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/media-casting.md",
+      "redirect_url": "/windows/apps/develop/media-playback/media-casting",
+      "redirect_document_id": false
+    },
+    {
+      "source_path": "uwp/audio-video-camera/enable-remote-audio-playback.md",
+      "redirect_url": "/windows/apps/develop/media-playback/enable-remote-audio-playback",
+      "redirect_document_id": false
     }
   ]
 }

hub/apps/develop/media-playback/adaptive-streaming-with-playready.md

@@ -112,4 +112,4 @@ If you want to register event handlers for the bound adaptive media source, you
 * [HLS tag support](hls-tag-support.md) 
 * [Dash profile support](dash-profile-support.md) 
 * [Play audio and video with MediaPlayer](play-audio-and-video-with-mediaplayer.md)
-* [Play media in the background](background-audio.md) 
+