fix(ci): Heredoc aus YAML entfernen — python3 -c statt <<PYEOF

.gitea/workflows/nightly.yml

@@ -153,20 +153,13 @@ jobs:
             2>/dev/null || true
 
           # Release erstellen — JSON via python3 serialisieren (kein SIGPIPE-Risiko)
-          python3 - "$TAG" "$VERSION" "$BODY_FILE" <<'PYEOF'
+          python3 -c "
 import sys, json
 tag, version, body_file = sys.argv[1], sys.argv[2], sys.argv[3]
 body = open(body_file).read()
-payload = json.dumps({
-    "tag_name": tag,
-    "name": f"KX-Bridge {version} Nightly",
-    "body": body,
-    "draft": False,
-    "prerelease": True
-})
-with open("/tmp/release_body.json", "w") as f:
-    f.write(payload)
-PYEOF
+payload = json.dumps({'tag_name': tag, 'name': 'KX-Bridge ' + version + ' Nightly', 'body': body, 'draft': False, 'prerelease': True})
+open('/tmp/release_body.json', 'w').write(payload)
+" "$TAG" "$VERSION" "$BODY_FILE"
           curl -s -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \
             -H "Content-Type: application/json" \