feat(operator): partner management with attach/detach (O.6)

- Partners list with name/domain/status/customers/margin + Create modal
- Partner detail: contract card, contact card, customers table, attach modal,
  terminate (soft-delete) danger card
- Operator proxies for /partners + /partners/:slug/tenants
- platform-api: add partnerId Prop to Tenant schema. The field was being
  silently dropped by Mongoose because the schema didn't declare it.
- tenants.service: rewrite update() to build $set/$unset explicitly and cast
  partnerId via new Types.ObjectId(). Handles detach via $unset so the field
  vanishes from the doc cleanly.

apps/operator/pages/partners/[slug].vue

@@ -0,0 +1,390 @@
+<script setup lang="ts">
+import type { Partner, PartnerStatus } from '~/types/partner'
+import type { Tenant } from '~/types/tenant'
+
+const route = useRoute()
+const slug = computed(() => route.params.slug as string)
+
+const { data: partner, refresh: refreshPartner } = await useFetch<Partner>(
+  () => `/api/partners/${slug.value}`,
+  { watch: [slug] },
+)
+
+const { data: customers, refresh: refreshCustomers } = await useFetch<Tenant[]>(
+  () => `/api/partners/${slug.value}/tenants`,
+  { default: () => [], watch: [slug] },
+)
+
+const STATUS_TONE: Record<PartnerStatus, 'ok' | 'warn' | 'neutral' | 'bad'> = {
+  active: 'ok',
+  'in-negotiation': 'warn',
+  paused: 'neutral',
+  terminated: 'bad',
+}
+
+const TENANT_STATUS_TONE = {
+  active: 'ok', pending: 'warn', suspended: 'bad', deleted: 'neutral',
+} as const
+
+// ── Attach tenant modal ───────────────────────────────────────────────────
+const attachOpen = ref(false)
+const attachBusy = ref(false)
+const attachError = ref<string | null>(null)
+const selectedSlug = ref('')
+
+const { data: allTenants } = await useFetch<Tenant[]>('/api/tenants', { default: () => [] })
+
+const attachable = computed(() => {
+  return (allTenants.value ?? []).filter(
+    (t) => !t.partnerId && t.status !== 'deleted',
+  )
+})
+
+function openAttach() {
+  selectedSlug.value = attachable.value[0]?.slug ?? ''
+  attachError.value = null
+  attachOpen.value = true
+}
+
+async function submitAttach() {
+  if (!selectedSlug.value || !partner.value) return
+  attachBusy.value = true
+  attachError.value = null
+  try {
+    await $fetch(`/api/tenants/${selectedSlug.value}`, {
+      method: 'PATCH',
+      body: { partnerId: partner.value._id },
+    })
+    attachOpen.value = false
+    await Promise.all([refreshPartner(), refreshCustomers()])
+  } catch (err: unknown) {
+    const e = err as { data?: { data?: { message?: string }; message?: string } }
+    attachError.value = e.data?.data?.message ?? e.data?.message ?? String(err)
+  } finally {
+    attachBusy.value = false
+  }
+}
+
+// ── Detach confirm ────────────────────────────────────────────────────────
+const detachTarget = ref<Tenant | null>(null)
+const detachBusy = ref(false)
+const detachError = ref<string | null>(null)
+
+async function confirmDetach() {
+  if (!detachTarget.value) return
+  detachBusy.value = true
+  detachError.value = null
+  try {
+    await $fetch(`/api/tenants/${detachTarget.value.slug}`, {
+      method: 'PATCH',
+      body: { partnerId: null },
+    })
+    detachTarget.value = null
+    await Promise.all([refreshPartner(), refreshCustomers()])
+  } catch (err: unknown) {
+    const e = err as { data?: { data?: { message?: string }; message?: string } }
+    detachError.value = e.data?.data?.message ?? e.data?.message ?? String(err)
+  } finally {
+    detachBusy.value = false
+  }
+}
+
+// ── Soft-terminate partner ────────────────────────────────────────────────
+const terminateOpen = ref(false)
+const terminateBusy = ref(false)
+const terminateError = ref<string | null>(null)
+
+async function confirmTerminate() {
+  terminateBusy.value = true
+  terminateError.value = null
+  try {
+    await $fetch(`/api/partners/${slug.value}`, { method: 'DELETE' })
+    await navigateTo('/partners')
+  } catch (err: unknown) {
+    const e = err as { data?: { data?: { message?: string }; message?: string } }
+    terminateError.value = e.data?.data?.message ?? e.data?.message ?? String(err)
+    terminateBusy.value = false
+  }
+}
+</script>
+
+<template>
+  <div v-if="partner">
+    <PageHeader
+      :eyebrow="`Partner · ${partner.slug}`"
+      :title="partner.name"
+      :subtitle="`${partner.customers} customer(s) · ${partner.marginPct}% revenue share · partner since ${partner.partnershipStartedAt ? new Date(partner.partnershipStartedAt).toISOString().slice(0, 10) : new Date(partner.createdAt).toISOString().slice(0, 10)}`"
+    >
+      <template #actions>
+        <Badge :tone="STATUS_TONE[partner.status]" dot>{{ partner.status }}</Badge>
+        <UiButton variant="secondary">
+          <template #leading><UiIcon name="external" :size="13" /></template>
+          Open {{ partner.domain }}
+        </UiButton>
+      </template>
+    </PageHeader>
+
+    <div class="stage">
+      <div class="grid">
+        <Card>
+          <h2>Contract</h2>
+          <dl>
+            <div class="dl-row"><dt>Slug</dt><dd><Mono>{{ partner.slug }}</Mono></dd></div>
+            <div class="dl-row"><dt>Domain</dt><dd><Mono>{{ partner.domain }}</Mono></dd></div>
+            <div class="dl-row"><dt>Status</dt><dd><Badge :tone="STATUS_TONE[partner.status]" dot>{{ partner.status }}</Badge></dd></div>
+            <div class="dl-row"><dt>Margin</dt><dd><Mono>{{ partner.marginPct }}%</Mono></dd></div>
+            <div class="dl-row"><dt>Customers</dt><dd>
+              <span class="num">{{ partner.customers }}</span>
+              <Mono dim>(MRR aggregation ships when Subscription gains pricing)</Mono>
+            </dd></div>
+          </dl>
+        </Card>
+
+        <Card>
+          <h2>Contact</h2>
+          <dl>
+            <div class="dl-row"><dt>Primary</dt><dd>{{ partner.contactInfo.primaryName || '—' }}</dd></div>
+            <div class="dl-row"><dt>Email</dt><dd><Mono :dim="!partner.contactInfo.primaryEmail">{{ partner.contactInfo.primaryEmail || '—' }}</Mono></dd></div>
+            <div class="dl-row"><dt>Billing</dt><dd><Mono :dim="!partner.contactInfo.billingEmail">{{ partner.contactInfo.billingEmail || '—' }}</Mono></dd></div>
+            <div class="dl-row"><dt>Company</dt><dd>{{ partner.billingInfo.companyName || '—' }}</dd></div>
+            <div class="dl-row"><dt>VAT</dt><dd><Mono :dim="!partner.billingInfo.vatId">{{ partner.billingInfo.vatId || '—' }}</Mono></dd></div>
+            <div class="dl-row"><dt>Country</dt><dd><Mono :dim="!partner.billingInfo.country">{{ partner.billingInfo.country || '—' }}</Mono></dd></div>
+          </dl>
+        </Card>
+      </div>
+
+      <Card :pad="0">
+        <div class="card-head padded">
+          <div>
+            <h2>Customers</h2>
+            <p class="hint">Tenants whose <code>partnerId</code> points at this partner.</p>
+          </div>
+          <UiButton variant="primary" :disabled="attachable.length === 0" @click="openAttach">
+            <template #leading><UiIcon name="plus" :size="13" /></template>
+            Attach tenant
+          </UiButton>
+        </div>
+        <table>
+          <thead>
+            <tr>
+              <th>Tenant</th><th>Status</th><th>Plan</th><th>Domains</th><th class="th-right">Actions</th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr v-if="(customers ?? []).length === 0" class="empty">
+              <td colspan="5">
+                <span class="empty-inner">No customers under this partner yet.</span>
+              </td>
+            </tr>
+            <tr v-for="t in (customers ?? [])" :key="t._id">
+              <td>
+                <NuxtLink class="link" :to="`/tenants/${t.slug}`">
+                  <div class="cell-name">{{ t.name }}</div>
+                  <Mono dim>{{ t.slug }}</Mono>
+                </NuxtLink>
+              </td>
+              <td><Badge :tone="TENANT_STATUS_TONE[t.status]" dot>{{ t.status }}</Badge></td>
+              <td><Badge tone="neutral">{{ t.plan }}</Badge></td>
+              <td><Mono :dim="!t.domains.length">{{ t.domains[0] || '—' }}</Mono></td>
+              <td class="td-right">
+                <UiButton variant="danger" size="sm" @click="detachTarget = t; detachError = null">Detach</UiButton>
+              </td>
+            </tr>
+          </tbody>
+        </table>
+      </Card>
+
+      <Card>
+        <h2 class="danger">Soft-terminate partner</h2>
+        <p>
+          Marks the partner as <Mono>terminated</Mono>. Customer tenants keep
+          their <Mono>partnerId</Mono> reference — we never hard-delete since
+          historical billing depends on it. To re-activate, edit the status
+          back to active via the admin API (UI editor lands later).
+        </p>
+        <UiButton
+          variant="danger"
+          :disabled="partner.status === 'terminated'"
+          @click="terminateOpen = true; terminateError = null"
+        >Terminate partner</UiButton>
+      </Card>
+    </div>
+
+    <!-- Attach tenant modal -->
+    <ConfirmDialog
+      :open="attachOpen"
+      :eyebrow="`Partner · ${partner.slug}`"
+      title="Attach a tenant"
+      confirm-label="Attach"
+      :busy="attachBusy"
+      @close="attachOpen = false"
+      @confirm="submitAttach"
+    >
+      <p>Pick an unattached tenant. Direct customers (those without a partner) show below.</p>
+      <select v-if="attachable.length" v-model="selectedSlug" class="select">
+        <option v-for="t in attachable" :key="t._id" :value="t.slug">
+          {{ t.name }} — {{ t.slug }} · {{ t.plan }}
+        </option>
+      </select>
+      <p v-else class="hint">No unattached tenants. Detach one from its current partner first.</p>
+      <p v-if="attachError" class="err">{{ attachError }}</p>
+    </ConfirmDialog>
+
+    <!-- Detach confirm -->
+    <ConfirmDialog
+      :open="detachTarget !== null"
+      :eyebrow="`Partner · ${partner.slug}`"
+      title="Detach this tenant?"
+      confirm-label="Detach"
+      tone="danger"
+      :busy="detachBusy"
+      @close="detachTarget = null"
+      @confirm="confirmDetach"
+    >
+      <p>
+        Remove <strong>{{ detachTarget?.name }}</strong> from <strong>{{ partner.name }}</strong>.
+        The tenant becomes a direct customer (no partner). Reversible — re-attach any time.
+      </p>
+      <p v-if="detachError" class="err">{{ detachError }}</p>
+    </ConfirmDialog>
+
+    <!-- Terminate partner confirm -->
+    <ConfirmDialog
+      :open="terminateOpen"
+      :eyebrow="`Partner · ${partner.slug}`"
+      title="Terminate this partner?"
+      confirm-label="Terminate"
+      tone="danger"
+      :busy="terminateBusy"
+      @close="terminateOpen = false"
+      @confirm="confirmTerminate"
+    >
+      <p>
+        Set <strong>{{ partner.name }}</strong> status to <Mono>terminated</Mono>. Existing
+        customer tenants keep their reference. To re-activate later, set status back via the
+        admin API.
+      </p>
+      <p v-if="terminateError" class="err">{{ terminateError }}</p>
+    </ConfirmDialog>
+  </div>
+</template>
+
+<style scoped>
+.stage {
+  padding: 24px 40px 64px 40px;
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
+  gap: 16px;
+}
+
+h2 {
+  font-family: var(--font-display);
+  font-weight: 600;
+  font-size: 16px;
+  letter-spacing: -0.01em;
+  margin: 0 0 16px 0;
+}
+h2.danger { color: var(--bad); }
+
+p {
+  margin: 0 0 14px 0;
+  color: var(--text-dim);
+  font-size: 13px;
+  line-height: 1.55;
+}
+p.hint { font-size: 12px; color: var(--text-mute); margin: 4px 0 0 0; }
+p.err { color: var(--bad); font-family: var(--font-mono); font-size: 12px; margin-top: 12px; }
+
+code {
+  font-family: var(--font-mono);
+  font-size: 12px;
+  background: rgba(244, 243, 238, 0.06);
+  padding: 1px 6px;
+  border-radius: 3px;
+}
+
+dl { display: flex; flex-direction: column; gap: 10px; }
+.dl-row {
+  display: grid;
+  grid-template-columns: 120px 1fr;
+  gap: 12px;
+  font-size: 13px;
+}
+dt {
+  font-family: var(--font-mono);
+  font-size: 10px;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  color: var(--text-mute);
+  align-self: center;
+}
+dd { margin: 0; color: var(--text); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
+
+.num {
+  font-family: var(--font-display);
+  font-weight: 600;
+  font-size: 18px;
+  letter-spacing: -0.01em;
+}
+
+.card-head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+}
+.card-head.padded { padding: 20px 24px 12px 24px; }
+.card-head h2 { margin: 0; }
+
+table { width: 100%; border-collapse: collapse; font-size: 13px; }
+thead tr { border-bottom: 1px solid var(--border); }
+th {
+  padding: 12px 16px;
+  text-align: left;
+  font-family: var(--font-mono);
+  font-size: 10px;
+  font-weight: 500;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  color: var(--text-mute);
+}
+th.th-right { text-align: right; }
+
+tbody tr { border-bottom: 1px solid var(--border); }
+tbody tr:last-child { border-bottom: none; }
+td { padding: 14px 16px; color: var(--text); }
+td.td-right { text-align: right; }
+
+.empty td { padding: 36px 16px; text-align: center; }
+.empty-inner { color: var(--text-mute); font-size: 13px; }
+
+.link {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  text-decoration: none;
+  color: var(--text);
+}
+.link:hover .cell-name { text-decoration: underline; }
+.cell-name { font-weight: 500; }
+
+.select {
+  width: 100%;
+  height: 36px;
+  padding: 0 10px;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  color: var(--text);
+  font-family: inherit;
+  font-size: 13px;
+  outline: none;
+}
+.select:focus { border-color: var(--accent); }
+</style>