feat(crm,ops): proceso comercial (solicitudes/RFQ, tarifas, cotizaciones) + Operaciones (embarques)

Diagrama 1 (CRM comercial) y Diagrama 2 (Operaciones) del spec de agente de carga:
- crm.service_requests (RFQ) + crm.rate_requests (solicitud de tarifas a proveedores)
- crm.quotes + crm.quote_items: conceptos costo/venta/margen, totales automáticos,
  estados borrador→enviada→aceptada/rechazada
- schema ops: ops.shipments (booking, Cut Off, ETD/ETA, naviera/agente aduanal/destino)
  y ops.shipment_documents (MBL/HBL, MAWB/HAWB, CMR…)
- liberar-a-operaciones: crea el embarque desde la cotización aceptada
- migración b3c4d5e6f7a8, routers/permisos, seed del flujo completo
- 52 tests pytest en verde

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/api/v1/modules/crm/quotes/dto.py

@@ -0,0 +1,102 @@
+from datetime import date, datetime
+from decimal import Decimal
+
+from pydantic import BaseModel, ConfigDict, Field, computed_field
+
+
+# ----- Quote items -----
+
+class QuoteItemBase(BaseModel):
+    concept: str = Field(..., max_length=60)
+    description: str | None = Field(None, max_length=255)
+    supplier_id: int | None = None
+    quantity: Decimal = Field(Decimal(1), ge=0, max_digits=12, decimal_places=2)
+    unit_cost: Decimal = Field(Decimal(0), ge=0, max_digits=14, decimal_places=2)
+    unit_sale: Decimal = Field(Decimal(0), ge=0, max_digits=14, decimal_places=2)
+    currency: str | None = Field(None, max_length=3)
+
+
+class QuoteItemCreate(QuoteItemBase):
+    quote_id: int
+
+
+class QuoteItemUpdate(BaseModel):
+    concept: str | None = Field(None, max_length=60)
+    description: str | None = Field(None, max_length=255)
+    supplier_id: int | None = None
+    quantity: Decimal | None = Field(None, ge=0, max_digits=12, decimal_places=2)
+    unit_cost: Decimal | None = Field(None, ge=0, max_digits=14, decimal_places=2)
+    unit_sale: Decimal | None = Field(None, ge=0, max_digits=14, decimal_places=2)
+    currency: str | None = Field(None, max_length=3)
+
+
+class QuoteItemResponse(QuoteItemBase):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    quote_id: int
+    tenant_id: int
+    company_id: int
+
+    @computed_field
+    @property
+    def line_cost(self) -> Decimal:
+        return (self.quantity or Decimal(0)) * (self.unit_cost or Decimal(0))
+
+    @computed_field
+    @property
+    def line_sale(self) -> Decimal:
+        return (self.quantity or Decimal(0)) * (self.unit_sale or Decimal(0))
+
+
+# ----- Quotes -----
+
+class QuoteBase(BaseModel):
+    reference: str | None = Field(None, max_length=40)
+    service_request_id: int | None = None
+    account_id: int | None = None
+    currency: str = Field("USD", max_length=3)
+    issue_date: date | None = None
+    valid_until: date | None = None
+    notes: str | None = None
+    terms: str | None = None
+    owner_user_id: str | None = Field(None, max_length=64)
+
+
+class QuoteCreate(QuoteBase):
+    pass
+
+
+class QuoteUpdate(BaseModel):
+    reference: str | None = Field(None, max_length=40)
+    service_request_id: int | None = None
+    account_id: int | None = None
+    currency: str | None = Field(None, max_length=3)
+    issue_date: date | None = None
+    valid_until: date | None = None
+    notes: str | None = None
+    terms: str | None = None
+    owner_user_id: str | None = Field(None, max_length=64)
+
+
+class QuoteResponse(QuoteBase):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    status: str
+    total_cost: Decimal
+    total_sale: Decimal
+    sent_at: datetime | None = None
+    accepted_at: datetime | None = None
+    rejected_at: datetime | None = None
+    created_by: str | None = None
+    updated_by: str | None = None
+    tenant_id: int
+    company_id: int
+    created_at: datetime
+    updated_at: datetime
+
+    @computed_field
+    @property
+    def margin(self) -> Decimal:
+        return (self.total_sale or Decimal(0)) - (self.total_cost or Decimal(0))