feat(i18n): seed en.json and wire locale copy to app output

src/ClaudeDo.App/ClaudeDo.App.csproj

@@ -28,5 +28,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\ClaudeDo.Ui\ClaudeDo.Ui.csproj" />
+    <ProjectReference Include="..\ClaudeDo.Localization\ClaudeDo.Localization.csproj" />
   </ItemGroup>
+  <Import Project="..\ClaudeDo.Localization\Locales.targets" />
 </Project>

src/ClaudeDo.Localization/ClaudeDo.Localization.csproj

@@ -7,4 +7,5 @@
   <ItemGroup>
     <InternalsVisibleTo Include="ClaudeDo.Localization.Tests" />
   </ItemGroup>
+  <Import Project="Locales.targets" />
 </Project>

src/ClaudeDo.Localization/Locales.targets

@@ -0,0 +1,7 @@
+<Project>
+  <ItemGroup>
+    <Content Include="$(MSBuildThisFileDirectory)locales\*.json"
+             Link="locales\%(Filename)%(Extension)"
+             CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+</Project>

src/ClaudeDo.Localization/locales/en.json

@@ -0,0 +1,13 @@
+{
+  "metadata": { "code": "en", "name": "English" },
+  "settings": {
+    "title": "SETTINGS",
+    "save": "Save",
+    "cancel": "Cancel",
+    "language": "Language",
+    "tabGeneral": "General",
+    "tabWorktrees": "Worktrees",
+    "tabFiles": "Files",
+    "tabPrime": "Prime Claude"
+  }
+}