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>

Language/StringResources.zh.xaml

@@ -0,0 +1,29 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:sys="clr-namespace:System;assembly=mscorlib">
+
+    <!-- Application -->
+    <sys:String x:Key="AppTitle">螢幕控制管理</sys:String>
+    <sys:String x:Key="ScreenSwitch">螢幕開關</sys:String>
+
+    <!-- Controls -->
+    <sys:String x:Key="Brightness">亮度</sys:String>
+    <sys:String x:Key="Contrast">對比度</sys:String>
+    <sys:String x:Key="InputSource">輸入源</sys:String>
+    <sys:String x:Key="Power">電源</sys:String>
+
+    <!-- Power States -->
+    <sys:String x:Key="PowerOn">開啟</sys:String>
+    <sys:String x:Key="Sleep">休眠</sys:String>
+    <sys:String x:Key="PowerOff">關閉</sys:String>
+
+    <!-- Window Controls -->
+    <sys:String x:Key="Minimize">最小化</sys:String>
+    <sys:String x:Key="Exit">結束</sys:String>
+    <sys:String x:Key="Loading">載入中...</sys:String>
+
+    <!-- Error Messages -->
+    <sys:String x:Key="LoadConfigErr">載入設定檔失敗: </sys:String>
+    <sys:String x:Key="SaveConfigErr">保存設定檔失敗: </sys:String>
+
+</ResourceDictionary>