pyload-ng: non-admin SETTINGS users can redirect all outbound traffic through an attacker-controlled proxy via unrestricted `proxy.*` config (incomplete fix for CVE-2026-33509 / -35463 / -35464 / -35586)

Summary The setconfigvalue API method @permissionPerms.SETTINGS in src/pyload/core/api/init.py gates security-sensitive options behind a hand-maintained allowlist ADMINONLYCOREOPTIONS. The allowlist contains "proxy", "username" and "proxy", "password" — which protect the proxy credentials — but i...