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/tests/test_service_requests.py

@@ -0,0 +1,66 @@
+import pytest
+from fastapi import HTTPException
+
+from api.v1.modules.crm.accounts import service as accounts_service
+from api.v1.modules.crm.accounts.dto import AccountCreate
+from api.v1.modules.crm.service_requests import service
+from api.v1.modules.crm.service_requests.dto import (
+    RateRequestCreate,
+    ServiceRequestCreate,
+    ServiceRequestUpdate,
+)
+
+T, C = 1, 1
+
+
+def test_create_service_request(db):
+    acc = accounts_service.create_account(db, AccountCreate(name="Cliente"), T, C)
+    sr = service.create_service_request(
+        db,
+        ServiceRequestCreate(
+            account_id=acc.id, operation_type="exportacion", transport_mode="maritimo",
+            service_type="puerta_puerta", origin="Manzanillo", destination="Long Beach",
+            incoterm="FOB", load_type="FCL",
+        ),
+        T, C, user_id="dev",
+    )
+    assert sr.id is not None
+    assert sr.status == "nueva"
+    assert sr.created_by == "dev"
+
+
+def test_service_request_rejects_unknown_account(db):
+    with pytest.raises(HTTPException) as exc:
+        service.create_service_request(db, ServiceRequestCreate(account_id=999, operation_type="importacion"), T, C)
+    assert exc.value.status_code == 422
+
+
+def test_filter_by_operation_and_status(db):
+    service.create_service_request(db, ServiceRequestCreate(operation_type="exportacion"), T, C)
+    service.create_service_request(db, ServiceRequestCreate(operation_type="importacion"), T, C)
+    exp = service.get_service_requests(db, T, C, operation_type="exportacion")
+    assert len(exp) == 1 and exp[0].operation_type == "exportacion"
+
+
+def test_rate_request_requires_service_request(db):
+    with pytest.raises(HTTPException) as exc:
+        service.create_rate_request(
+            db, RateRequestCreate(service_request_id=999, concept="flete_internacional"), T, C
+        )
+    assert exc.value.status_code == 404
+
+
+def test_rate_request_ok_and_listed(db):
+    sr = service.create_service_request(db, ServiceRequestCreate(operation_type="exportacion"), T, C)
+    service.create_rate_request(
+        db, RateRequestCreate(service_request_id=sr.id, concept="flete_internacional", rate_amount=1200, currency="USD"),
+        T, C,
+    )
+    rates = service.get_rate_requests(db, T, C, service_request_id=sr.id)
+    assert len(rates) == 1 and rates[0].concept == "flete_internacional"
+
+
+def test_update_service_request_status(db):
+    sr = service.create_service_request(db, ServiceRequestCreate(operation_type="exportacion"), T, C)
+    upd = service.update_service_request(db, sr.id, ServiceRequestUpdate(status="en_analisis"), T, C)
+    assert upd.status == "en_analisis"