feat(backend): sync endpoints + all models + seed + order workflow
- All business models: Vehicle, Order, OrderLine, Invoice, Appointment, CatalogMarca/Model/Ansamblu/Norma/Pret/TipDeviz/TipMotor, Mecanic - Sync endpoints: GET /sync/full, GET /sync/changes?since=, POST /sync/push with tenant isolation and last-write-wins conflict resolution - Order CRUD with state machine: DRAFT -> VALIDAT -> FACTURAT Auto-recalculates totals (manopera + materiale) - Vehicle CRUD: list, create, get, update - Seed data: 24 marci, 11 ansamble, 6 tipuri deviz, 5 tipuri motoare, 3 preturi - Alembic migration for all business models - 13 passing tests (auth + sync + orders) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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