ci: supply required user input to NuGet/login

The NuGet Publish workflow's Authenticate step failed with
"Input required and not supplied: user" on the first workflow_dispatch
attempt for v3.0.4. NuGet/login@v1 requires the package owner's
NuGet.org username for Trusted Publishing OIDC; package metadata shows
the owner is ANcpLua.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ANcpLua

.github/workflows/nuget-publish.yml

@@ -84,6 +84,8 @@ jobs:
       - name: Authenticate with NuGet
         uses: NuGet/login@v1
         if: github.event_name == 'release' || github.event_name == 'workflow_dispatch'
+        with:
+          user: ANcpLua
 
       - name: Publish packages to NuGet.org
         if: github.event_name == 'release' || github.event_name == 'workflow_dispatch'