feat: add a read-only Jadlog price probe

app/jadlog.py prices one package through Jadlog's Simulador de Frete as the
API manual v2.3 describes it; app.jadlog_probe prices test weights to six
regions on the client's account to confirm token, account and contract.
Tested against a fake transport. The roadmap records the Jadlog data and the
Mercado Pago account setup.

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

.gitea/workflows/deploy.yml

@@ -86,7 +86,7 @@ jobs:
       # the generator's geometry. The provider suites use a fake transport: they
       # prove the documented contract, not the integration.
       - name: Print-file geometry and provider adapters
-        run: $COMPOSE exec -T api python -m unittest tests.test_printfile tests.test_mercadopago tests.test_tiny -v
+        run: $COMPOSE exec -T api python -m unittest tests.test_printfile tests.test_mercadopago tests.test_tiny tests.test_jadlog -v
 
       - name: Runtime and retention regressions
         run: |