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>

backend/app/db/models/__init__.py

@@ -1,4 +1,35 @@
 from app.db.models.tenant import Tenant
 from app.db.models.user import User
+from app.db.models.vehicle import Vehicle
+from app.db.models.order import Order
+from app.db.models.order_line import OrderLine
+from app.db.models.catalog import (
+    CatalogMarca,
+    CatalogModel,
+    CatalogAnsamblu,
+    CatalogNorma,
+    CatalogPret,
+    CatalogTipDeviz,
+    CatalogTipMotor,
+)
+from app.db.models.invoice import Invoice
+from app.db.models.appointment import Appointment
+from app.db.models.mecanic import Mecanic
 
-__all__ = ["Tenant", "User"]
+__all__ = [
+    "Tenant",
+    "User",
+    "Vehicle",
+    "Order",
+    "OrderLine",
+    "CatalogMarca",
+    "CatalogModel",
+    "CatalogAnsamblu",
+    "CatalogNorma",
+    "CatalogPret",
+    "CatalogTipDeviz",
+    "CatalogTipMotor",
+    "Invoice",
+    "Appointment",
+    "Mecanic",
+]

backend/app/db/models/appointment.py

@@ -0,0 +1,11 @@
+from sqlalchemy import String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class Appointment(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "appointments"
+    vehicle_id: Mapped[str] = mapped_column(String(36))
+    data: Mapped[str] = mapped_column(Text)
+    descriere: Mapped[str | None] = mapped_column(Text)

backend/app/db/models/catalog.py

@@ -0,0 +1,44 @@
+from sqlalchemy import Float, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class CatalogMarca(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "catalog_marci"
+    nume: Mapped[str] = mapped_column(String(100))
+
+
+class CatalogModel(Base, UUIDMixin, TimestampMixin):
+    __tablename__ = "catalog_modele"
+    marca_id: Mapped[str] = mapped_column(String(36), index=True)
+    nume: Mapped[str] = mapped_column(String(100))
+
+
+class CatalogAnsamblu(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "catalog_ansamble"
+    nume: Mapped[str] = mapped_column(String(100))
+
+
+class CatalogNorma(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "catalog_norme"
+    ansamblu_id: Mapped[str] = mapped_column(String(36), index=True)
+    descriere: Mapped[str] = mapped_column(Text)
+    ore: Mapped[float] = mapped_column(Float, default=0)
+
+
+class CatalogPret(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "catalog_preturi"
+    denumire: Mapped[str] = mapped_column(String(200))
+    pret: Mapped[float] = mapped_column(Float, default=0)
+    um: Mapped[str] = mapped_column(String(10))
+
+
+class CatalogTipDeviz(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "catalog_tipuri_deviz"
+    nume: Mapped[str] = mapped_column(String(100))
+
+
+class CatalogTipMotor(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "catalog_tipuri_motoare"
+    nume: Mapped[str] = mapped_column(String(50))

backend/app/db/models/invoice.py

@@ -0,0 +1,13 @@
+from sqlalchemy import Float, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class Invoice(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "invoices"
+    order_id: Mapped[str] = mapped_column(String(36), index=True)
+    nr_factura: Mapped[str] = mapped_column(String(50))
+    data_factura: Mapped[str | None] = mapped_column(Text)
+    total: Mapped[float] = mapped_column(Float, default=0)
+    status: Mapped[str] = mapped_column(String(20), default="EMISA")

backend/app/db/models/mecanic.py

@@ -0,0 +1,10 @@
+from sqlalchemy import String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class Mecanic(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "mecanici"
+    nume: Mapped[str] = mapped_column(String(200))
+    telefon: Mapped[str | None] = mapped_column(String(20))

backend/app/db/models/order.py

@@ -0,0 +1,19 @@
+from sqlalchemy import Float, Integer, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class Order(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "orders"
+    vehicle_id: Mapped[str] = mapped_column(String(36))
+    tip_deviz_id: Mapped[str | None] = mapped_column(String(36))
+    status: Mapped[str] = mapped_column(String(20), default="DRAFT")
+    data_comanda: Mapped[str | None] = mapped_column(Text)
+    km_intrare: Mapped[int | None] = mapped_column(Integer)
+    observatii: Mapped[str | None] = mapped_column(Text)
+    mecanic_id: Mapped[str | None] = mapped_column(String(36))
+    total_manopera: Mapped[float] = mapped_column(Float, default=0)
+    total_materiale: Mapped[float] = mapped_column(Float, default=0)
+    total_general: Mapped[float] = mapped_column(Float, default=0)
+    token_client: Mapped[str | None] = mapped_column(String(36))

backend/app/db/models/order_line.py

@@ -0,0 +1,17 @@
+from sqlalchemy import Float, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class OrderLine(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "order_lines"
+    order_id: Mapped[str] = mapped_column(String(36), index=True)
+    tip: Mapped[str] = mapped_column(String(20))  # manopera | material
+    descriere: Mapped[str] = mapped_column(Text)
+    ore: Mapped[float] = mapped_column(Float, default=0)
+    pret_ora: Mapped[float] = mapped_column(Float, default=0)
+    cantitate: Mapped[float] = mapped_column(Float, default=0)
+    pret_unitar: Mapped[float] = mapped_column(Float, default=0)
+    um: Mapped[str | None] = mapped_column(String(10))
+    total: Mapped[float] = mapped_column(Float, default=0)

backend/app/db/models/vehicle.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Integer, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base, UUIDMixin, TenantMixin, TimestampMixin
+
+
+class Vehicle(Base, UUIDMixin, TenantMixin, TimestampMixin):
+    __tablename__ = "vehicles"
+    nr_inmatriculare: Mapped[str] = mapped_column(String(20))
+    vin: Mapped[str | None] = mapped_column(String(17))
+    marca_id: Mapped[str | None] = mapped_column(String(36))
+    model_id: Mapped[str | None] = mapped_column(String(36))
+    an_fabricatie: Mapped[int | None] = mapped_column(Integer)
+    tip_motor_id: Mapped[str | None] = mapped_column(String(36))
+    capacitate_motor: Mapped[str | None] = mapped_column(String(20))
+    putere_kw: Mapped[str | None] = mapped_column(String(20))
+    client_nume: Mapped[str | None] = mapped_column(String(200))
+    client_telefon: Mapped[str | None] = mapped_column(String(20))
+    client_email: Mapped[str | None] = mapped_column(String(200))
+    client_cui: Mapped[str | None] = mapped_column(String(20))
+    client_adresa: Mapped[str | None] = mapped_column(Text)