feat: portal redesign, pricing catalog, partner-staff invites

- portal: new admin/ and partner/ surfaces with full component library
  (AppLauncher, Avatar, Badge, Card, Modal, Tabs, etc.), composables,
  layouts, partner-routing middleware, and supporting server APIs
- pricing: Price schema/module with operator CRUD, pricing.vue catalog UI,
  Subscription extended with cycle/currency/perSeatAmount/seats snapshots
  for stable MRR aggregation
- partner staff: User.partnerId, invite-partner-user DTO and flow,
  /partners/:slug/users endpoints, InvitePartnerUserModal, shared
  dezky-partner-staff Authentik group
- /me: partner-aware endpoint returning user + partner context so portal
  can route between end-user and partner-admin surfaces
- tenant: seats field for portfolio displays and future MRR calculations
- operator: pricing page, signed-out page, useMe/useToast composables,
  ToastStack

apps/operator/composables/useToast.ts

@@ -0,0 +1,37 @@
+// Lightweight toast stack. Used by buttons/actions that want to confirm
+// they fired. Rendered by components/ToastStack.vue in the default layout.
+
+export type ToastTone = 'info' | 'ok' | 'warn' | 'bad'
+
+export interface Toast {
+  id: number
+  tone: ToastTone
+  message: string
+  hint?: string
+}
+
+const toasts = ref<Toast[]>([])
+let counter = 0
+
+export const useToast = () => {
+  function push(tone: ToastTone, message: string, hint?: string) {
+    const id = ++counter
+    toasts.value = [...toasts.value, { id, tone, message, hint }]
+    const ttl = tone === 'bad' ? 7000 : 4000
+    setTimeout(() => {
+      toasts.value = toasts.value.filter((t) => t.id !== id)
+    }, ttl)
+  }
+  function dismiss(id: number) {
+    toasts.value = toasts.value.filter((t) => t.id !== id)
+  }
+  return {
+    toasts,
+    push,
+    info: (m: string, h?: string) => push('info', m, h),
+    ok: (m: string, h?: string) => push('ok', m, h),
+    warn: (m: string, h?: string) => push('warn', m, h),
+    bad: (m: string, h?: string) => push('bad', m, h),
+    dismiss,
+  }
+}