feat(crm): tarifario — editor de cargos adicionales + alta manual de rutas

- Backend: CRUD de cargos (rate_charges) por tarifario.
- Frontend: detalle del tarifario con alta manual de rutas (con editor de quiebres
  para aéreo/LCL) y sección de cargos adicionales (agregar/eliminar).

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

backend/api/v1/modules/crm/rates/routes.py

@@ -14,6 +14,9 @@ from .dto import (
     CostResult,
     ImportPreview,
     RateBreakDTO,
+    RateChargeCreate,
+    RateChargeResponse,
+    RateChargeUpdate,
     RateLaneCreate,
     RateLaneResponse,
     RateSheetCreate,
@@ -187,6 +190,56 @@ def delete_lane(
     service.delete_lane(db, tenant_id, sheet_id, lane_id)
 
 
+# ---------------- Cargos adicionales ----------------
+@router.get("/{sheet_id}/charges", response_model=list[RateChargeResponse])
+def list_charges(
+    sheet_id: int,
+    company_id: int = Query(...),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id, _ = _ctx(current_user)
+    service.get_sheet(db, tenant_id, company_id, sheet_id)
+    return service.list_charges(db, tenant_id, sheet_id)
+
+
+@router.post("/{sheet_id}/charges", response_model=RateChargeResponse, status_code=status.HTTP_201_CREATED)
+def create_charge(
+    sheet_id: int,
+    data: RateChargeCreate,
+    company_id: int = Query(...),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id, _ = _ctx(current_user)
+    return service.create_charge(db, tenant_id, company_id, sheet_id, data)
+
+
+@router.patch("/{sheet_id}/charges/{charge_id}", response_model=RateChargeResponse)
+def update_charge(
+    sheet_id: int,
+    charge_id: int,
+    data: RateChargeUpdate,
+    company_id: int = Query(...),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id, _ = _ctx(current_user)
+    return service.update_charge(db, tenant_id, sheet_id, charge_id, data)
+
+
+@router.delete("/{sheet_id}/charges/{charge_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_charge(
+    sheet_id: int,
+    charge_id: int,
+    company_id: int = Query(...),
+    current_user: dict = Depends(get_current_user),
+    db: Session = Depends(get_core_db),
+):
+    tenant_id, _ = _ctx(current_user)
+    service.delete_charge(db, tenant_id, sheet_id, charge_id)
+
+
 # ---------------- Motor de costeo ----------------
 cost_router = APIRouter(tags=["Tarifario"])