Add runtime script management with Home Assistant integration

Features:
- Runtime script CRUD operations (create, update, delete)
- Thread-safe ConfigManager for YAML updates
- WebSocket notifications for script changes
- Web UI script management interface with full CRUD
- Home Assistant auto-reload on script changes
- Client-side position interpolation for smooth playback
- Include command field in script list API response

Technical improvements:
- Added broadcast_scripts_changed() to WebSocket manager
- Enhanced HA integration to handle scripts_changed messages
- Implemented smooth position updates in Web UI (100ms interval)
- Thread-safe configuration updates with file locking

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

media_server/service/install_task_windows.ps1

@@ -1,6 +1,7 @@
+Unregister-ScheduledTask -TaskName "MediaServer" -Confirm:$false
+
 # Get the project root directory (two levels up from this script)
 $projectRoot = (Get-Item $PSScriptRoot).Parent.Parent.FullName
-
 $action = New-ScheduledTaskAction -Execute "python" -Argument "-m media_server.main" -WorkingDirectory $projectRoot
 $trigger = New-ScheduledTaskTrigger -AtStartup
 $principal = New-ScheduledTaskPrincipal -UserId "$env:USERNAME" -LogonType S4U -RunLevel Highest