findRemittances used `payments: true` which returned raw RemittancePayment
join records without actual payment data. Now fetches full Payment objects
via manual join and maps them to the remittance records so the mobile app
can display client names, amounts, and invoice numbers.
- New migration: make users.tenantId nullable for super_admin
- Dockerfile: RUN_SEED=true env var triggers seed after migrations
- Seed uses npx tsx (available in node_modules)
