feat(tenders): add Tender Management module (SRS, backend, frontend)
- SRS document: docs/SRS_TENDER_MANAGEMENT.md
- Prisma: Tender, TenderDirective models; Deal.sourceTenderId; Attachment.tenderId/tenderDirectiveId
- Backend: tenders module (CRUD, duplicate check, directives, notifications, file upload, convert-to-deal)
- Frontend: tenders list, detail, create/edit forms, directives, convert to deal, i18n (en/ar), dashboard card
- Seed: tenders permissions for admin and sales positions
- Auth: admin.service findFirst for email check (Prisma compatibility)
Made-with: Cursor
4c139429e2