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/portal/components/Avatar.vue

@@ -0,0 +1,48 @@
+<script setup lang="ts">
+const props = withDefaults(
+  defineProps<{ name?: string; size?: number }>(),
+  { name: '?', size: 32 },
+)
+
+const palette = ['#3D3D38', '#3F5B47', '#5B4D3F', '#3F4D5B', '#5B3F4D', '#4D5B3F']
+
+const initials = computed(() =>
+  props.name
+    .split(' ')
+    .filter(Boolean)
+    .slice(0, 2)
+    .map((p) => p[0].toUpperCase())
+    .join(''),
+)
+
+const color = computed(() => {
+  let s = 0
+  for (let i = 0; i < props.name.length; i++) s = (s * 31 + props.name.charCodeAt(i)) >>> 0
+  return palette[s % palette.length]
+})
+</script>
+
+<template>
+  <div
+    class="avatar"
+    :style="{
+      width: size + 'px',
+      height: size + 'px',
+      background: color,
+      fontSize: size * 0.36 + 'px',
+    }"
+  >{{ initials }}</div>
+</template>
+
+<style scoped>
+.avatar {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 999px;
+  color: #F4F3EE;
+  font-weight: 600;
+  letter-spacing: -0.01em;
+  flex-shrink: 0;
+}
+</style>