Add brightness/contrast sliders, input source switching, and 9-language localization

- Add VCP commands for brightness (10), contrast (12), input source (60)
- Fix UTF-16 encoding for monitor data parsing
- Add system tray app with monitor controls
- Add localization for en, es, fr, de, zh, ja, pt, it, hi
- Update to .NET 9.0
- Add LICENSE and README

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

DellMonitorControl/App.xaml

@@ -1,17 +1,12 @@
 <Application x:Class="DellMonitorControl.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:tb="clr-namespace:Hardcodet.Wpf.TaskbarNotification;assembly=Hardcodet.Wpf.TaskbarNotification.Net6"
              xmlns:local="clr-namespace:DellMonitorControl"
-             StartupUri="MainWindow.xaml">
+             Startup="Application_Startup">
     <Application.Resources>
-        <ResourceDictionary>
-            <ResourceDictionary.MergedDictionaries>
-                <ResourceDictionary Source="/Style/Color.xaml"/>
-                <ResourceDictionary Source="/Images/Icons.xaml"/>
-                <ResourceDictionary Source="/Style/Main.xaml"/>
-                <ResourceDictionary Source="/Style/Btn.xaml"/>
-                <ResourceDictionary Source="/Style/Slider.xaml"/>
-            </ResourceDictionary.MergedDictionaries>
-        </ResourceDictionary>
+        <tb:TaskbarIcon x:Key="TrayIcon"
+                        IconSource="/DellLogo.ico"
+                        ToolTipText="Monitor Control"/>
     </Application.Resources>
 </Application>