Fix CI: use Gitea username 'nate' for container registry login

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

.github/workflows/docker-publish.yml

@@ -40,7 +40,7 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: git.necloud.us
-          username: nate@versebyversewithnate.us
+          username: nate
           password: ${{ secrets.GITEA_TOKEN }}
 
       - name: Extract metadata