feat: converter map hysteria2 port hopping and realm URI

[Medium1992]

Extends the hysteria2 mapping in ConvertsV2Ray for more stable parsing of subscriptions and retrieval of the full configuration:

fm= (Xray finalmask JSON) — dashboards (remnawave/3x-ui) include it in the URI as an xhttp extra. Breakdown: salamander→obfs, salamander+packetSize→gecko obfs (+obfs-min/max-packet-size), quicParams→up/down/ports/hop-interval/bbr-profile. Flat URI parameters remain the priority.
Port hopping—the official format is host:443,5000-6000 in the address (url.Parse used to reject this → previously, the entire subscription would fail) → ports.
hysteria2+realm://—a new official scheme from the hysteria docs → realm-opts; the realm mask in fm is also supported.
Purely additive: without fm/realm/multi-port, behavior remains the same.

[wwqgtxx]

Thank you for your submission. The rest of the commit looks good, but please remove the FM handling; we do not intend to support this non-standard extension.

[Medium1992]

Thank you for your submission. The rest of the commit looks good, but please remove the FM handling; we do not intend to support this non-standard extension.

fm has been deleted