Drop partnerTeam, partnerInvoices, partnerActivity and partnerAudit from data/customers.ts — these had no remaining importers now that team, billing, dashboard activity and audit run on real data. The still-used partner / customers / partnerMrrSparkline exports (partner-mode customer switcher + decorative sparkline) stay until those consumers are migrated.
Move partner domain types out of data/customers.ts into types/partner.ts so the fixture data exports can be removed later without breaking type imports. Add usePartnerTenants / usePartnerMrr composables wrapping the shared-key partner fetches.