feat(docs-site): read footer from the per-tenant CMS collection

The shared unom CMS is now multi-tenant; the footer global became a per-tenant
collection. Query footers scoped to tenant.slug = punktfunk instead of the
removed /globals/footer.

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

docs-site/src/lib/cms.ts

@@ -1,8 +1,12 @@
-// The docs reuse the punktfunk marketing site's footer — the same Payload CMS
-// global on the shared unom CMS (cms.unom.io). It's a read-only GET, so a plain
-// typed fetch rather than pulling in the Payload SDK + generated types.
+// The docs reuse the punktfunk footer from the shared unom CMS (cms.unom.io).
+// The CMS is multi-tenant: footer is a per-tenant collection, so scope the read
+// to this project's tenant. Read-only GET, so a plain typed fetch rather than
+// pulling in the Payload SDK + generated types.
 const CMS_URL = 'https://cms.unom.io'
 
+// This project's tenant in the shared CMS.
+const TENANT = 'punktfunk'
+
 export interface NavigationLink {
   id?: string | null
   label?: string | null
@@ -20,8 +24,10 @@ export interface Footer {
   sections?: NavigationSection[] | null
 }
 
-export async function findFooter(): Promise<Footer> {
-  const res = await fetch(`${CMS_URL}/api/globals/footer?locale=en&depth=1`)
+export async function findFooter(): Promise<Footer | null> {
+  const query = `where%5Btenant.slug%5D%5Bequals%5D=${TENANT}&locale=en&depth=1&limit=1`
+  const res = await fetch(`${CMS_URL}/api/footers?${query}`)
   if (!res.ok) throw new Error(`CMS footer request failed: ${res.status}`)
-  return res.json() as Promise<Footer>
+  const data = (await res.json()) as { docs?: Footer[] }
+  return data.docs?.[0] ?? null
 }