fix(release): re-enable workflow_call publish path in prepare-release

Tag push events never fire on this Gitea 1.25.x instance (confirmed
across 159 workflow run history). The workflow_call path is reliable and
has worked consistently. Remove the temporary if-false guard.

.gitea/workflows/prepare-release.yml

@@ -153,7 +153,6 @@ jobs:
           fi
 
   publish:
-    if: ${{ false }} # Temporary: disable direct call to validate tag-triggered do-release path.
     needs: prepare
     uses: ./.gitea/workflows/do-release.yml
     with: