Fix build error

Author: Claude

NuGet.config

@@ -3,5 +3,27 @@
   <packageSources>
     <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="Umbraco Prereleases" value="https://www.myget.org/F/umbracoprereleases/api/v3/index.json" />
+    <add key="Umbraco Nightly" value="https://www.myget.org/F/umbraconightly/api/v3/index.json" />
+    <add key="Umbraco Cloud Bundle" value="https://www.myget.org/F/uc-bundle/api/v3/index.json" />
   </packageSources>
+  <packageSourceMapping>
+    <packageSource key="nuget.org">
+      <package pattern="Umbraco" />
+      <package pattern="Umbraco.*" />
+      <package pattern="*" />
+    </packageSource>
+    <packageSource key="Umbraco Cloud Bundle">
+      <package pattern="Umbraco" />
+      <package pattern="Umbraco.*" />
+    </packageSource>
+    <packageSource key="Umbraco Prereleases">
+      <package pattern="Umbraco" />
+      <package pattern="Umbraco.*" />
+    </packageSource>
+    <packageSource key="Umbraco Nightly">
+      <package pattern="Umbraco" />
+      <package pattern="Umbraco.*" />
+    </packageSource>
+  </packageSourceMapping>
 </configuration>