Host.AllowInsecure was only wired into the shared VLESS/VMess/Trojan/Shadowsocks
endpoint path (applyEndpointAllowInsecure). Hysteria/Hysteria2 builds its links
through its own applyExternalProxyHysteriaParams (raw hysteria2:// link) and
buildHysteriaProxy (Clash/Mihomo proxy), neither of which read the host's
allowInsecure flag, so a self-signed Hysteria2 host never got insecure=1 or
skip-cert-verify: true. Fixes#5865.
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>