Improve LibVLC stability and add external playback host

- Add LibVLCManager singleton for safer LibVLC lifetime management
- Introduce VlcHostClient and VlcHost.exe for external playback via JSON commands
- Enhance VideoPlayer with error recovery and dependency property for SourceUrl
- Implement IDisposable in ProgramsData and ViewModels for better cleanup
- Update NuGet packages: LibVLCSharp to 3.9.6, System.Reactive to 6.1.0
- Add robust error handling and resource disposal throughout
- Improve program guide handling in PlayerViewModel

TV Player WPF/LibVLCManager.cs

@@ -0,0 +1,47 @@
+using LibVLCSharp.Shared;
+
+namespace TV_Player
+{
+    public static class LibVLCManager
+    {
+        private static readonly object _lock = new object();
+        private static LibVLC _instance;
+
+        public static LibVLC Instance
+        {
+            get
+            {
+                if (_instance != null) return _instance;
+                lock (_lock)
+                {
+                    if (_instance == null)
+                    {
+                        Core.Initialize();
+                        // Use conservative libvlc options to reduce native crashes
+                        var options = new[]
+                        {
+                            "--ignore-config",
+                            "--no-osd",
+                            "--no-snapshot-preview",
+                            "--avcodec-hw=none",
+                            "--network-caching=3000",
+                            "--http-reconnect",
+                            "--rtsp-tcp"
+                        };
+                        _instance = new LibVLC(options);
+                    }
+                    return _instance;
+                }
+            }
+        }
+
+        public static void Dispose()
+        {
+            lock (_lock)
+            {
+                try { _instance?.Dispose(); } catch { }
+                _instance = null;
+            }
+        }
+    }
+}