Next Step 3d slice. Five plain-object factories — Vless, Vmess, Trojan,
Shadowsocks, Hysteria — replace the legacy
`new Inbound.<Protocol>Settings.<Protocol>(...)` constructor chain and the
ClientBase XrayCommonClass machinery. Each factory takes an optional
seed; missing random fields (id, password, auth, email, subId) fall
through to RandomUtil at call time. Forms can hand-pick a UUID; tests
pass deterministic seeds so the suite never touches window.crypto.
Tests double-verify each factory: a snapshot locks the exact shape, and
the matching Zod ClientSchema.parse(out) must equal `out` — no missing
defaults, no stray fields, type-narrowed end-to-end.
Discovered: VmessClientSchema and VlessClientSchema enforce z.uuid()
format, so the test seeds use real-shape UUIDs.
Suite: 49 tests across 6 files; typecheck + lint clean. Outbound and
inbound-settings factories follow in subsequent turns alongside the
toShareLink extraction.