feat(web): unify console + docs on @unom/ui; host OpenAPI via Scalar

Move the management console (web/) off shadcn/ui to the shared @unom/ui
design system the marketing site + docs are built on, on the punktfunk
violet brand over dark chrome:

- Add @unom/ui/@unom/style/motion/radix-ui/zod + Geist; web/.npmrc maps the
  @unom scope (packages are public-read, so CI needs no npm auth).
- styles.css: one dark-violet palette (#141019/#1c1530, brand #6c5bf3 ->
  #a79ff8) exposed under BOTH the shadcn token names the routes use and
  @unom/ui's contract, so routes + components both resolve; pulls in
  @unom/ui's material gloss + easings.
- components/ui/* now back onto @unom/ui (AnimatedButton/InputText/Label/
  AnimatedCard); brand-mark/wordmark/logo replace the generic Radio icon in
  the shell + login.
- MaterialProvider (specular gloss) at the root. No UI sounds, like the site.

docs-site: new /api route renders the host management REST API as an
interactive Scalar reference (reads public/openapi.json, a snapshot of
docs/api/openapi.json), branded violet and linked from the top nav, the
docs sidebar, the landing page, and host-cli.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs-site/README.md

@@ -7,6 +7,19 @@ Content lives in [`content/docs/`](content/docs) as `.md`/`.mdx`. Several pages
 verbatim from the repo's `docs/` design notes (with added frontmatter); edit those there or
 here as the docs site becomes the source of truth.
 
+## API reference
+
+`/api` renders the host's **management REST API** as an interactive
+[Scalar](https://github.com/scalar/scalar) reference (linked from the top nav, the docs
+sidebar, and the landing page). It reads [`public/openapi.json`](public/openapi.json) — a
+**snapshot** of the repo's generated spec. Refresh it after a management-API change:
+
+```sh
+# from the repo root — regenerate the spec, then copy the snapshot in:
+cargo run -p punktfunk-host -- openapi > docs/api/openapi.json
+cp docs/api/openapi.json docs-site/public/openapi.json
+```
+
 ## Develop
 
 ```sh
@@ -31,6 +44,7 @@ src/
     __root.tsx            RootProvider + html shell
     index.tsx            landing page
     docs/$.tsx           catch-all docs renderer (Fumadocs DocsLayout)
+    api/index.tsx        Scalar API reference (reads public/openapi.json)
     api/search.ts        Orama search endpoint
   lib/source.ts          Fumadocs loader over the generated collection
   lib/layout.shared.tsx  shared nav chrome