feat(website): partner program page + reseller conversion sections

Add the /partners page rendering the partner pitch: benefits, an interactive
margin calculator (seats × margin → monthly/annual, off the 49 kr list price),
a reseller-facing "CSP vs Dezky" comparison, partner tiers, a 3-step "get
started", and a partner FAQ. Wire the section-06 "see the partner program"
button to it, and align the whitelabel margin bullet to 15–40%.

apps/website/components/landing/PartnerCalculator.vue

@@ -0,0 +1,54 @@
+<script setup lang="ts">
+// Interactive reseller margin calculator. Uses the public 49 kr/user/mo list
+// price and the partner margin band; outputs monthly + annual margin. Numbers
+// are illustrative — final wholesale terms are set in the partner agreement.
+import { ref, computed } from 'vue'
+import { useTheme, useCopy } from '~/composables/useLanding'
+
+const t = useTheme()
+const copy = useCopy()
+const c = computed(() => copy.value.pages.partners.calc)
+
+const LIST_PRICE = 49 // DKK per user per month
+
+const seats = ref(100)
+const marginPct = ref(30)
+
+const monthly = computed(() => Math.round(seats.value * LIST_PRICE * (marginPct.value / 100)))
+const annual = computed(() => monthly.value * 12)
+
+const dkk = new Intl.NumberFormat('da-DK', { style: 'currency', currency: 'DKK', maximumFractionDigits: 0 })
+const fmtMonthly = computed(() => dkk.format(monthly.value))
+const fmtAnnual = computed(() => dkk.format(annual.value))
+</script>
+
+<template>
+  <div :style="{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '0', border: `1px solid ${t.border}`, borderRadius: '4px', overflow: 'hidden' }">
+    <!-- Controls -->
+    <div :style="{ padding: '36px', background: t.surface, display: 'flex', flexDirection: 'column', gap: '36px', justifyContent: 'center' }">
+      <div>
+        <div :style="{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline', marginBottom: '12px' }">
+          <span :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.06em', textTransform: 'uppercase' }">{{ c.seatsLabel }}</span>
+          <span :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: '20px', color: t.fg }">{{ seats }}</span>
+        </div>
+        <input v-model.number="seats" type="range" min="10" max="1000" step="10" :style="{ width: '100%', accentColor: t.signal, cursor: 'pointer' }" >
+      </div>
+      <div>
+        <div :style="{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline', marginBottom: '12px' }">
+          <span :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.06em', textTransform: 'uppercase' }">{{ c.marginLabel }}</span>
+          <span :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: '20px', color: t.fg }">{{ marginPct }} %</span>
+        </div>
+        <input v-model.number="marginPct" type="range" min="15" max="40" step="1" :style="{ width: '100%', accentColor: t.signal, cursor: 'pointer' }" >
+      </div>
+    </div>
+
+    <!-- Output -->
+    <div :style="{ padding: '36px', background: t.bgAlt, borderLeft: `1px solid ${t.border}`, display: 'flex', flexDirection: 'column', justifyContent: 'center' }">
+      <div :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.08em', textTransform: 'uppercase' }">{{ c.monthlyLabel }}</div>
+      <div :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: 'clamp(40px, 5vw, 60px)', letterSpacing: '-0.03em', lineHeight: 1.0, color: t.fg, marginTop: '8px' }">{{ fmtMonthly }}</div>
+      <div :style="{ marginTop: '20px', paddingTop: '20px', borderTop: `1px solid ${t.border}`, fontFamily: '\'Inter\', sans-serif', fontSize: '15px', color: t.fgMuted }">
+        {{ c.annualLabel }} <span :style="{ color: t.fg, fontWeight: 600 }">{{ fmtAnnual }}</span>
+      </div>
+    </div>
+  </div>
+</template>