refactor(portal): partner-mode customer switcher on real tenants

Migrate the partner-mode customer switcher, in-customer banner, sidebar tile and the team invite/teammate panels off the data/customers fixture onto the real /api/partner/tenants list (shared key, gated to partner-staff so the global shell doesn't 403 for other users). Active customer resolves by tenant _id (the key the customers page already passes to partnerMode.enter); partner-identity labels now use the real partner name from useMe. Removes the now-unused customers + CustomerOrg-list fixture export and the dead setCustomer helper. Verified in UI: switcher + enter/exit show real Baslund Test / Baslund Research ApS.

apps/portal/components/CustomerModeBanner.vue

@@ -3,13 +3,22 @@
 // specific customer org. Distinct color (indigo — partner mode is normal
 // operating mode, not danger). Persistent until partner exits.
 
-import { customers } from '~/data/customers'
+import type { PartnerTenantDoc } from '~/types/partner'
 
 const partnerMode = usePartnerMode()
 const router = useRouter()
+const { partner, isPartnerStaff } = useMe()
+
+// Real tenant list (shared key; gated to partner-staff so the layout-level
+// banner doesn't 403 the partner endpoint for other users).
+const { data: tenants } = useFetch<PartnerTenantDoc[]>('/api/partner/tenants', {
+  key: 'partner-tenants',
+  default: () => [],
+  immediate: isPartnerStaff.value,
+})
 
 const activeCustomer = computed(() =>
-  customers.find((c) => c.id === partnerMode.activeCustomerId.value) || null,
+  (tenants.value ?? []).find((c) => c._id === partnerMode.activeCustomerId.value) || null,
 )
 
 onMounted(() => partnerMode.hydrate())
@@ -25,7 +34,7 @@ function exit() {
     <span class="dot" />
     <div class="meta">
       <Mono>Partner view</Mono>
-      <span class="text">managing <strong>{{ activeCustomer.name }}</strong> · actions are attributed to NordicMSP in the customer's audit log</span>
+      <span class="text">managing <strong>{{ activeCustomer.name }}</strong> · actions are attributed to {{ partner?.name ?? 'your partner org' }} in the customer's audit log</span>
     </div>
     <button class="exit" @click="exit">
       <UiIcon name="logout" :size="12" />