Make asset upload resilient (warn on duplicate, don't fail)

.github/workflows/release.yml

@@ -151,6 +151,7 @@ jobs:
               -H "Authorization: token ${GITEA_TOKEN}" \
               -H "Content-Type: application/zip" \
               --data-binary "@${zip_path}" \
-              "${API}/repos/${REPO}/releases/${release_id}/assets?name=${asset_name}"
+              "${API}/repos/${REPO}/releases/${release_id}/assets?name=${asset_name}" \
-            echo "Uploaded Gitea asset: ${asset_name}"
+              || echo "::warning::Asset upload failed (asset may already exist); continuing."
+            echo "Gitea asset step complete: ${asset_name}"
           fi