refactor(portal): delete data/customers.ts fixture entirely

Replace the last two holdouts: the dashboard partner-identity fallback now uses the real useMe().partner name, and the decorative MRR sparkline (dashboard + reports) moves to a generated useMrrTrendline() — deterministic, clearly placeholder-only, until a daily MRR-snapshot job exists. Removes the dead sparkLast/sparkTrendPct vars. The data/customers.ts fixture module is now fully deleted; the partner portal carries no mock business data.

apps/portal/pages/partner/reports.vue

@@ -8,14 +8,16 @@
 
 
 
-// Decorative MRR sparkline shape only — historical MRR isn't stored yet (a
-// daily-snapshot job lands later). The live numbers below are all real.
-import { partnerMrrSparkline } from '~/data/customers'
 import type { CustomerOrg, CustomerStatus } from '~/types/partner'
 import type { TaskContext } from '~/components/partner/CustomerTaskPanel.vue'
 
 const toast = useToast()
 
+// Decorative MRR sparkline shape only — historical MRR isn't stored yet (a
+// daily-snapshot job lands later; see useMrrTrendline). The live numbers
+// below are all real.
+const mrrTrend = useMrrTrendline()
+
 // ── Real data sources ─────────────────────────────────────────────────────
 const { tenants } = usePartnerTenants()
 const { mrrByTenant } = usePartnerMrr()
@@ -450,7 +452,7 @@ onMounted(() => {
           </div>
         </div>
         <div class="big-chart">
-          <PartnerSparkline :values="partnerMrrSparkline" :width="1080" :height="160" stroke="var(--text)" fill="var(--row-hover)" />
+          <PartnerSparkline :values="mrrTrend" :width="1080" :height="160" stroke="var(--text)" fill="var(--row-hover)" />
           <div class="chart-foot">
             <span>90-day trend · illustrative</span>
             <span>{{ totalMrr.toLocaleString('da-DK') }} DKK / mo now</span>