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/partner/InviteTeammateModal.vue

@@ -3,7 +3,8 @@
 // scoping + require-MFA toggle + optional personal note. Invitations expire
 // after 7 days — the design surfaces that explicitly.
 
-import { customers } from '~/data/customers'
+const { tenants } = usePartnerTenants()
+const PLAN_LABEL: Record<string, string> = { mvp: 'Starter', pro: 'Business', enterprise: 'Enterprise' }
 
 defineProps<{ open: boolean }>()
 const emit = defineEmits<{
@@ -115,18 +116,18 @@ function planBadgeTone(p: string) {
 
         <div v-if="access === 'specific'" class="picker">
           <div class="picker-head">
-            <Mono dim>{{ specific.length }} of {{ customers.length }} selected</Mono>
+            <Mono dim>{{ specific.length }} of {{ tenants.length }} selected</Mono>
           </div>
           <div class="picker-list">
-            <label v-for="c in customers" :key="c.id" class="picker-row">
+            <label v-for="c in tenants" :key="c._id" class="picker-row">
               <input
                 type="checkbox"
-                :checked="specific.includes(c.id)"
-                @change="toggleCustomer(c.id)"
+                :checked="specific.includes(c.slug)"
+                @change="toggleCustomer(c.slug)"
               />
-              <div class="cust-swatch" :style="{ background: c.brandColor }" />
+              <div class="cust-swatch" :style="{ background: c.brandColor || '#0A0A0A' }" />
               <span class="cust-name">{{ c.name }}</span>
-              <Badge :tone="planBadgeTone(c.plan)">{{ c.planLabel }}</Badge>
+              <Badge :tone="planBadgeTone(c.plan ?? 'pro')">{{ PLAN_LABEL[c.plan ?? 'pro'] }}</Badge>
             </label>
           </div>
         </div>