feat(fin,ops): Facturación y Cobranza (Diag. 4), bitácora de embarque (Diag. 3) y subida a MinIO

- schema fin: fin.invoices + fin.invoice_items + fin.payments; totales con IVA,
  estados borrador→emitida→enviada→pagada, cobranza (pagos) y saldo automático
- generar-factura-desde-embarque (toma conceptos de venta de la cotización)
- ops.shipment_events: bitácora/hitos del embarque con secuencia por defecto
  según operación (importación/exportación) — cubre Diagrama 3
- subida de documentos a MinIO: POST /crm/uploads (multipart) + URL firmada
- migración c4d5e6f7a8b9, routers/permisos (fin), seed del flujo hasta factura
- 58 tests pytest en verde

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

backend/api/v1/modules/ops/shipments/routes.py

@@ -10,6 +10,9 @@ from .dto import (
     ShipmentDocumentCreate,
     ShipmentDocumentResponse,
     ShipmentDocumentUpdate,
+    ShipmentEventCreate,
+    ShipmentEventResponse,
+    ShipmentEventUpdate,
     ShipmentResponse,
     ShipmentUpdate,
 )
@@ -130,3 +133,67 @@ def delete_shipment_document(
     db: Session = Depends(get_core_db),
 ):
     service.delete_shipment_document(db, doc_id, current_user["tenant_id"], company_id)
+
+
+# ----- Bitácora / hitos -----
+
+@router.get("/shipments/{shipment_id}/events", response_model=list[ShipmentEventResponse])
+def list_shipment_events(
+    shipment_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    service.get_shipment(db, shipment_id, current_user["tenant_id"], company_id)
+    return service.get_shipment_events(db, current_user["tenant_id"], company_id, shipment_id)
+
+
+@router.post("/shipments/{shipment_id}/events/seed", response_model=list[ShipmentEventResponse])
+def seed_shipment_events(
+    shipment_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    return service.seed_default_milestones(db, shipment_id, current_user["tenant_id"], company_id)
+
+
+@router.post("/shipment-events", response_model=ShipmentEventResponse, status_code=status.HTTP_201_CREATED)
+def create_shipment_event(
+    payload: ShipmentEventCreate,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    return service.create_shipment_event(db, payload, current_user["tenant_id"], company_id)
+
+
+@router.patch("/shipment-events/{event_id}", response_model=ShipmentEventResponse)
+def update_shipment_event(
+    event_id: int,
+    payload: ShipmentEventUpdate,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    return service.update_shipment_event(db, event_id, payload, current_user["tenant_id"], company_id)
+
+
+@router.patch("/shipment-events/{event_id}/complete", response_model=ShipmentEventResponse)
+def complete_shipment_event(
+    event_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    return service.complete_shipment_event(db, event_id, current_user["tenant_id"], company_id)
+
+
+@router.delete("/shipment-events/{event_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_shipment_event(
+    event_id: int,
+    company_id: int = Query(..., description="Company ID"),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    service.delete_shipment_event(db, event_id, current_user["tenant_id"], company_id)