feat(m1): storage layer

- Shared SQLite plumbing: PRAGMAs (WAL/NORMAL/foreign_keys) and
  user_version migrations with typed SchemaVersionException
- Workspace folder: .ykanban initialization, empty schema with
  DDL-level constraints, preset column seeding (ResX-driven),
  exclusive lock file with holder diagnostics
- AppData folder: app.db workspace registry (injectable clock),
  app.json config store with kebab-case JSON names via explicit
  [JsonProperty]/[EnumMember], nested sections, corrupt-file backup
- ResX infrastructure under Assets/Locales (en + zh-Hans) with
  MSBuild strongly-typed public Resources class
- 54 unit tests: DDL constraints, migrations, PRAGMAs, lock
  exclusivity, config degradation, culture-aware presets

YKanBan/YKanBan.csproj

@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
     <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
     <ApplicationManifest>app.manifest</ApplicationManifest>
@@ -9,7 +10,24 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <AvaloniaResource Include="Assets\**" />
+    <AvaloniaResource Include="Assets\**" Exclude="Assets\Locales\**" />
+  </ItemGroup>
+
+  <!--Strongly-typed ResX resources generated by the cross-platform MSBuild generator.
+      LogicalName is pinned so the manifest names stay stable despite the Assets/Locales location.-->
+  <ItemGroup>
+    <EmbeddedResource Update="Assets/Locales/Resources.resx">
+      <Generator>MSBuild:Compile</Generator>
+      <StronglyTypedFileName>$(IntermediateOutputPath)Resources.Designer.cs</StronglyTypedFileName>
+      <StronglyTypedNamespace>YKanBan</StronglyTypedNamespace>
+      <StronglyTypedClassName>Resources</StronglyTypedClassName>
+      <StronglyTypedLanguage>CSharp</StronglyTypedLanguage>
+      <PublicClass>true</PublicClass>
+      <LogicalName>YKanBan.Resources.resources</LogicalName>
+    </EmbeddedResource>
+    <EmbeddedResource Update="Assets/Locales/Resources.zh-Hans.resx">
+      <LogicalName>YKanBan.Resources.zh-Hans.resources</LogicalName>
+    </EmbeddedResource>
   </ItemGroup>
 
   <ItemGroup>