feat: partner enrichment, mutations, settings & branding + operator quick-wins

Backend (platform-api): computed tenant health plus industry/brandColor; partner-scoped tenant update/suspend/resume guarded by assertPartnerOwnsTenant; enriched partner users (MFA + access level) with invite/remove; partner settings and whitelabel branding persistence; Authentik authenticator counting and group removal. Audit on every mutation.

Frontend (portal): all five partner pages on real data — dashboard alerts, customers edit/suspend, team MFA/access with invite/remove, editable settings, branding fetch/save.

Operator: dashboard and infrastructure service health driven by real liveness probes; fabricated uptime/p95/error-rate removed.

apps/portal/server/api/partner/users/[subject].delete.ts

@@ -0,0 +1,23 @@
+// Remove a teammate from the partner organization. Forwards to platform-api
+// DELETE /me/partner/users/:subject (ownership + last-admin guard server-side).
+import { getUserSession } from 'nuxt-oidc-auth/runtime/server/utils/session.js'
+
+export default defineEventHandler(async (event) => {
+  const session = await getUserSession(event).catch(() => null)
+  const accessToken = (session as { accessToken?: string } | null)?.accessToken
+  if (!accessToken) {
+    throw createError({ statusCode: 401, statusMessage: 'Not signed in' })
+  }
+
+  const subject = getRouterParam(event, 'subject')
+  const base = process.env.PLATFORM_API_INTERNAL_URL ?? 'http://platform-api:3001'
+  try {
+    return await $fetch(`${base}/me/partner/users/${subject}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${accessToken}` },
+    })
+  } catch (err: unknown) {
+    const e = err as { statusCode?: number; data?: unknown }
+    throw createError({ statusCode: e.statusCode ?? 500, data: e.data })
+  }
+})