Lay the groundwork for OutboundFormModal's Pattern A rewrite:
- schemas/forms/outbound-form.ts: discriminated-union form values across
all 12 outbound protocols, with flat per-protocol settings shapes that
match the legacy class fields (vmess vnext / trojan-ss-socks-http
servers / wireguard csv address-reserved all flattened).
- lib/xray/outbound-form-adapter.ts: rawOutboundToFormValues converts
wire-shape outbound JSON to typed form values; formValuesToWirePayload
re-nests on submit. Replaces the Outbound.fromJson/toJson dependency
the modal currently has on the legacy class hierarchy.
- test/outbound-form-adapter.test.ts: 15 round-trip cases covering each
protocol's wire quirks (vmess vnext flatten, vless reverse-wrap,
wireguard csv↔array, blackhole response wrap, DNS rule normalization,
mux gating).
