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/router.py

@@ -17,6 +17,8 @@ from .leads.routes import router as leads_router
 from .metrics.routes import router as metrics_router
 from .opportunities.routes import router as opportunities_router
 from .pipelines.routes import router as pipelines_router
+from .quotes.routes import router as quotes_router
+from .service_requests.routes import router as service_requests_router
 from .suppliers.routes import router as suppliers_router
 
 router = APIRouter()
@@ -26,6 +28,8 @@ router.include_router(suppliers_router)
 router.include_router(contacts_router)
 router.include_router(addresses_router)
 router.include_router(documents_router)
+router.include_router(service_requests_router)
+router.include_router(quotes_router)
 router.include_router(leads_router)
 router.include_router(pipelines_router)
 router.include_router(opportunities_router)