chore(docs): update dependencies and adapt to zbsearch 4

fumadocs-core 16.14.5 switched its search engine from Orama to zbsearch 4,
so the panel docs follow it up to the same major.

zbsearch 4 still rejects locale codes as tokenizer languages ("en" throws,
only "english" is accepted), so the custom search dialog that forces an
English index stays necessary — verified by loading the built static index
for all four locales and searching it through fumadocs' own client.

Around that:
- use `staticClient`, as `oramaStaticClient` is now a deprecated alias
- drop @orama/orama, which nothing depends on or imports any more
- correct the two comments that still described Orama and pointed at its
  docs and tokenizer package, one of them suggesting a language zbsearch
  does not have
- restore the corepack integrity hash on `packageManager`, which CI reads
  through pnpm/action-setup
- prune minimumReleaseAgeExclude entries for versions no longer installed

The API reference MDX changes are serialization-only: fumadocs-openapi
11.2.4 emits plain scalars where it used folded ones. Parsed frontmatter
and page bodies are unchanged.

docs/app/api/search/route.ts

@@ -5,13 +5,8 @@ import { createFromSource } from 'fumadocs-core/search/server';
 export const revalidate = false;
 export const dynamic = 'force-static';
 
-// Static search index: works under both SSR/Vercel and static export
-// (`output: 'export'`). The client loads this prebuilt index and searches
-// in-browser (see the `type: 'static'` search option in app/[lang]/layout.tsx).
-// All locales currently hold English (fallback) content, and Orama has no
-// Persian tokenizer, so map every locale to the English tokenizer. When real
-// translations land, switch ru -> 'russian', zh -> 'mandarin' (with
-// @orama/tokenizers), etc. See https://docs.orama.com/open-source/supported-languages
+// Every locale still serves English fallback content, so all map to zbsearch's
+// English tokenizer (its SUPPORTED_LANGUAGES has no Persian or Chinese anyway).
 export const { staticGET: GET } = createFromSource(source, {
   localeMap: {
     en: 'english',