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/MainWindow.xaml

@@ -1,21 +1,15 @@
 <Window x:Class="DellMonitorControl.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:tb="clr-namespace:Hardcodet.Wpf.TaskbarNotification;assembly=Hardcodet.Wpf.TaskbarNotification.Net6"
-        xmlns:local="clr-namespace:DellMonitorControl"
-        mc:Ignorable="d"
-        Title="MainWindow" Height="450" Width="800">
-    
-    <Grid>
-        <tb:TaskbarIcon x:Name="taskbar"
-                        IconSource="/DellLogo.ico"
-                        ToolTipText="螢幕開關"
-                        PopupActivation="LeftOrDoubleClick">
-            <tb:TaskbarIcon.TrayPopup>
-                <local:ControlPanel x:Name="comtrolPanel"/>
-            </tb:TaskbarIcon.TrayPopup>
-        </tb:TaskbarIcon>
-    </Grid>
+        Title="Monitor Control" Height="400" Width="320"
+        WindowStyle="ToolWindow"
+        ResizeMode="CanResize"
+        Background="#333333">
+
+    <ScrollViewer VerticalScrollBarVisibility="Auto" Margin="10">
+        <StackPanel Name="sp">
+            <TextBlock Text="Monitor Control" Foreground="White" FontSize="16" FontWeight="Bold"/>
+            <TextBlock Text="Loading..." Foreground="LightGray" FontSize="12" Margin="0,10,0,0"/>
+        </StackPanel>
+    </ScrollViewer>
 </Window>