feat: 统一项目命名并补充路径失效报告

将内部项目目录、命名空间、配置目录、自启注册表值和设计/开发文档统一为 PersonalToolbox。

扩展路径校验服务，输出失效工具、字段、原因和路径，并在启动日志、设置页路径检查与导入配置流程中展示明细报告。

验证：dotnet build PersonalToolbox.sln

src/PersonalToolbox/App.xaml

@@ -0,0 +1,32 @@
+<Application x:Class="PersonalToolbox.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+        <SolidColorBrush x:Key="AppBackgroundBrush" Color="#F7F8FA" />
+        <SolidColorBrush x:Key="PanelBackgroundBrush" Color="#FFFFFF" />
+        <SolidColorBrush x:Key="BorderBrushSoft" Color="#D9DEE7" />
+        <SolidColorBrush x:Key="PrimaryBrush" Color="#2563EB" />
+        <SolidColorBrush x:Key="PrimaryTextBrush" Color="#172033" />
+        <SolidColorBrush x:Key="SecondaryTextBrush" Color="#5C667A" />
+
+        <Style TargetType="Button">
+            <Setter Property="MinHeight" Value="32" />
+            <Setter Property="Padding" Value="12,4" />
+        </Style>
+
+        <Style TargetType="TextBox">
+            <Setter Property="Padding" Value="8,4" />
+            <Setter Property="VerticalContentAlignment" Value="Center" />
+        </Style>
+
+        <Style TargetType="ComboBox">
+            <Setter Property="Padding" Value="8,4" />
+            <Setter Property="VerticalContentAlignment" Value="Center" />
+        </Style>
+
+        <Style TargetType="ListBoxItem">
+            <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+        </Style>
+    </Application.Resources>
+</Application>