docs+site: Nightjar brand, hosted service, infrastructure plan, saved site

Persists the branding/commercial/infrastructure work (previously only in chat and
on the live site) into version control.

What changed:
- docs/naming.md: due-diligence and the decision to brand the product Nightjar
  (OpenScribe domain/GitHub/trademark collisions; alternatives screened; why Nightjar).
- docs/hosted-service.md: the commercial model - plan tiers (Self-host / Cloud
  Starter / Cloud Pro / Private), indicative pricing, backend mapping, and the
  build-to-sell roadmap (metering, billing, provisioning, DPA).
- docs/infrastructure.md: backend infra plan. Primary option = self-host on the
  3x Minisforum MS-02 cluster (one with an RTX 3050 6GB) fronted by a Cloudflare
  Tunnel, with node roles, the 3050 capacity reality, caveats, and a Hetzner cloud
  fallback. Provision-later.
- site/: reproducible marketing-site source - block content for all 11 pages
  (rebranded to Nightjar), the navigation, the Contact Form 7 config (honeypot),
  the ApisCP SOAP helper (tools/apiscp.php, no secret), and a README on how the
  WordPress site is built and managed via the API.
- state/: DECISIONS (Nightjar rebrand, hosted service, MS-02 backend), PROJECT
  (brand + commercial section), TODO (rename decision, trademark, mailbox, pricing,
  hosted-service build, infra provisioning).

Why:
- User asked to save everything to the repo. Captures the product rebrand, the
  commercialisation plan, and the infrastructure decision so a cold session has the
  full picture.

Notes:
- The repo is still named `openscribe`; the product/brand is Nightjar. A full
  codebase rename is deferred (tracked in TODO + docs/naming.md).
- No secrets committed: the ApisCP API key is read from a local scratch file, never
  the repo.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

site/pages/contact.html

@@ -0,0 +1 @@
+<!-- wp:heading {"level":1} --><h1 class="wp-block-heading">Contact</h1><!-- /wp:heading --><!-- wp:paragraph {"fontSize":"large"} --><p class="has-large-font-size">Register your interest in a hosted plan, or ask to be notified when the open-source code is released.</p><!-- /wp:paragraph --><!-- wp:paragraph --><p>Tell us a little about what you are after. If it is a hosted plan, a rough idea of how many hours of audio you record per month helps us follow up with early-access pricing. We read every message.</p><!-- /wp:paragraph --><!-- wp:shortcode -->[contact-form-7 id="55b5907" title="Contact form 1"]<!-- /wp:shortcode --><!-- wp:paragraph {"fontSize":"small"} --><p class="has-small-font-size">Built by 12 Hobbies Studio. Nightjar is an independent open-source project and is not affiliated with Plaud.</p><!-- /wp:paragraph -->