feat: price home delivery with Jadlog

FREIGHT_ADAPTER=jadlog prices "Receber em casa" through Jadlog's Simulador
de Frete from the order's billed metres and value, adding production days
to Jadlog's delivery time. The package weight is a base plus a weight per
metre from the client, with no default: the adapter refuses to start
without it and without the credentials. The cart re-quotes when the package
changes, and approval quotes again from the server-priced items. The
production stack takes the Jadlog settings, so the read-only probe runs
from the worker's console.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/runtime.py

@@ -25,7 +25,11 @@ if os.environ.get('PAYMENT_ADAPTER') == 'mercadopago':
     payment = MercadoPagoPayment()
 else:
     payment = FakePayment()
-freight = FakeFreight()
+if os.environ.get('FREIGHT_ADAPTER') == 'jadlog':
+    from .jadlog import JadlogFreight
+    freight = JadlogFreight()
+else:
+    freight = FakeFreight()
 ENVIRONMENT = os.environ.get('APP_ENV', 'local')
 PUBLIC_ORIGIN = os.environ.get('PUBLIC_ORIGIN', 'http://localhost')
 ALLOWED_HOSTS = [host for host in os.environ.get('ALLOWED_HOSTS', 'localhost,127.0.0.1').split(',') if host]