Create UAT seed pipeline for ALLA OS.

Requirements:
1. Add CSV import seed support from /src/db/seeds/uat-csv/*.csv
2. Import order:
   organizations
   branches
   product_types
   users
   memberships
   document_sequences
   customers
   contacts
   leads_opportunities
   quotations
   quotation_items
   approval_steps
3. Add npm scripts:
   - seed:system
   - seed:org
   - seed:uat
   - db:reset:uat
4. Seed must be idempotent using upsert.
5. Reset must clear transactional CRM data first, then seed foundation/master/UAT data again.
6. Preserve organization boundary: ALLA and ONVALLA data must not mix.
7. Verify login personas:
   IT → MK → Sale → Manager → CEO
8. Verify document sequence by organization + branch + product type.
