feat: fill the delivery address from the CEP and quote freight as it is typed

A complete CEP now looks up its address on the server (ViaCEP, rate
limited, keeping the Site's CSP to its own origin) and fills street,
district, city and state, moving the cursor to the first field left, and
quotes the freight without pressing Calcular. The CEP keeps its mask when
the cart is restored. Freight and its delivery time appear in the order
summary instead of a line under the CEP, the delivery option says it ships
with Jadlog, and the address reminder is a hint rather than an error.

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

web/site-v2.css

@@ -228,6 +228,8 @@ section+section{border-top:0}
 /* The payment pages: paying on the left, the order summary on the right */
 html:is([data-rota="pagamento"],[data-rota="pix"]) .checkout{max-width:1040px;margin-top:8px}
 html:is([data-rota="pagamento"],[data-rota="pix"]) .pagGrid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:32px;align-items:start}
+.dicaEnd{font-size:13px;color:var(--texto2);margin-top:12px}
+.dicaEnd:empty{display:none}
 .pagCab{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:20px}
 .pagCab h3{font-size:26px;font-weight:800;letter-spacing:-.02em}
 .pagVolta{font-size:14px;color:var(--texto2)}