[MiddleSokilAI]

Legacy Manager/API entrypoints can dispatch OnPageNotFound before the HTTP request service is bound, causing Target class [request] does not exist. Storefront alias resolution can also run again after an internal forward, and a stale product placeholder can replace the selected error document.

The routing guards skip Manager/API and requestless alias resolution, avoid re-entering alias lookup after internal forwards, and preserve internally selected error/unauthorized documents. Empty paths no longer access an undefined array offset. Valid product and language-prefixed aliases keep working.

The full regression suite also exposed two existing failures: quick checkout retained a validated piece quantity as a string, and the piece cart/order JSON fixture omitted physical fields already emitted by the base branch. Piece quantities now become integers after validation and the maximum check; validation plugins still receive raw input. The JSON fixture now includes the existing weight and dimension fields without changing totals or quantities.

Verification

• PHP 8.4.20: runtime scripts and standalone regression scripts passed locally, including 41 checkout validation checks, 158 measured quantity checks and 35 webhook dispatch checks.
• All 10 routing scenarios passed separately: missing request, Manager, API, product, language prefix, empty path, unknown path, internal forward, 404 and 401.
• PHP lint and git diff --check passed.
• GitHub CI passed on PHP 8.4 and 8.5: https://github.com/Seiger/sCommerce/actions/runs/41451729127 (head b4118fe).

Tests use isolated data and do not contact the site database, payment providers or TMS. No production deployment has been performed.