feat(hostinger): add @distilled.cloud/hostinger SDK

[ebauger]

Adds @distilled.cloud/hostinger — Effect-native SDK for the Hostinger API (VPS, DNS, domains, hosting, billing, reach), generated with create-sdk-full from the official OpenAPI spec (hostinger/api, openapi.json at the repo root, added as a direct submodule).

import { VPSGetDataCenterListV1 } from "@distilled.cloud/hostinger/Operations";

const dataCenters = yield* VPSGetDataCenterListV1({});

• 128 operations; Bearer auth via HOSTINGER_API_TOKEN ({ apiKey: Redacted, apiBaseUrl } credentials, neon-style)
• HostingerValidationError carries the per-field details Hostinger attaches to 422s
• CI wiring for test.yml/nuke.yml

Spec patches (live-verified)

Two patches back deviations observed against the real API:

• 002-action-state-open-enum: the published enum for action state is success|error|delayed|sent|created, but the live API also returns started (observed on ct_set_hostname and ct_recreate actions) — decoding failed mid-poll, so the patch opens the enum to a plain string.
• 001-add-subscription-cancel: adds DELETE /api/billing/v1/subscriptions/{subscriptionId}, the endpoint Hostinger's own Terraform provider uses to deprovision a VPS. ⚠️ It is absent from the published spec AND currently returns 404 route-not-found on the public API (probed live 2026-06-11 — the official provider's destroy is equally broken). Kept with that caveat in the patch description since it is the only known VPS deletion path if Hostinger restores it; happy to drop it from this PR if you'd rather not ship a currently-dead operation.

Verified live beyond unit shape-checks: auth + reads, and the full VPS lifecycle driven through an out-of-tree Alchemy provider built on this SDK (purchase → provisioning wait → hostname update via the actions API → docker compose projects → snapshots → auto-renewal disable).

[Mkassabov]

Superseded by #511, which carries this work on an origin branch so it can be merged as part of the SDK stack (GitHub stacks cannot include fork PRs). Thanks @ebauger — credited there.