ci: use warning annotation for existing release fallback

.gitea/workflows/release.yml

@@ -62,7 +62,7 @@ jobs:
               print(json.dumps(data, indent=2), file=sys.stderr)
               sys.exit(1)
           " 2>&1) || {
-            echo "Create failed, fetching existing release for tag $TAG..."
+            echo "::warning::Release already exists for tag $TAG — reusing existing release"
             RELEASE=$(curl -s "$BASE_URL/releases/tags/$TAG" \
               -H "Authorization: token $DEPLOY_TOKEN")
             RELEASE_ID=$(echo "$RELEASE" | python3 -c "import sys,json; print(json.load(sys.stdin)['id'])")