feat: add FabWorks.Api with ExportsController and DTOs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

FabWorks.Api/FabWorks.Api.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>disable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FabWorks.Core\FabWorks.Core.csproj" />
+  </ItemGroup>
+
+</Project>