refactor: split the Site's behaviour out of one 1,575-line inline script

dtf-site.html held commercial rules, the nesting engine, PDF analysis, the cart
and every handler in a single inline script, 42% of the runtime code in one
file, and the money logic lived in the middle of it.

It is now nine files under local/static, cut at the section markers the original
author left, so no function was split across a boundary: config, product modes,
upload, sheet analysis, PDF, quality, packing, cart, flow. They load as classic
scripts in the original order and share one global scope, so evaluation is
exactly what it was; the extraction was checked byte-identical against the
original before the tags replaced it. dtf-site.html is 1,394 lines of markup and
style.

With no inline script left anywhere, the policy no longer needs a hash
allowlist: script-src is now 'self' alone, which is stronger than what it
replaced and cannot drift as the page changes.

Three things depended on the old shape and were updated rather than worked
around. The pricing parity test read the ladder out of the HTML and now reads it
from site-config.js, still proving the server agrees with what the customer is
shown. The isolated artwork test served four hardcoded script paths and now
serves any script that resolves inside local/static, so the next file added does
not silently 404. The CSP assertion checked the whole policy for 'unsafe-inline'
and now checks the script-src directive alone, since style-src legitimately
carries it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

local/static/site-cart.js

@@ -0,0 +1,77 @@
+/* Site DTF — Cart totals and the order summary.
+   Extracted verbatim from the single inline script in dtf-site.html.
+   Loaded as classic scripts in the order listed there: they share one global
+   scope and run top to bottom, exactly as the original did. */
+// ── carrinho
+let itemAtual=null;
+function limpaPaineis(){
+  ['qual','prev'].forEach(id=>$(id).classList.remove('on'));
+  if(!pedido.length){ $('carr').classList.remove('on'); }
+}
+
+// O carrinho junta itens de produtos diferentes e cobra uma vez só.
+function pintaPedido(){
+  $('itens').innerHTML = pedido.map((it,i)=>
+    '<div class="item"><div class="nm2"><b>'+escapeHTML(it.tit)+'</b><span>'+escapeHTML(it.desc)+'</span></div>'+
+    '<div class="vl2">'+rs(it.total)+'</div>'+
+    '<button class="x" data-rmi="'+i+'" aria-label="Remover">×</button></div>').join('');
+  $('itens').querySelectorAll('[data-rmi]').forEach(b=>b.addEventListener('click',()=>{
+    pedido.splice(+b.dataset.rmi,1); pintaPedido();
+  }));
+  const itens = pedido.reduce((t,it)=>t+it.total,0) + (itemAtual? itemAtual.total : 0);
+  const frete = entrega.tipo==='frete' && entrega.cotado ? entrega.valor : 0;
+  const soma = itens + frete;
+  const n = pedido.length + (itemAtual?1:0);
+  const eco = [...pedido, ...(itemAtual?[itemAtual]:[])]
+    .reduce((t,it)=>t+(TABELA[it.modo]-it.unit)*it.cob, 0);
+  $('resLin').innerHTML =
+    '<div class="l"><span>'+n+(n===1?' item':' itens')+'</span><b>'+rs(itens+eco)+'</b></div>'+
+    (eco>0.01? '<div class="l" style="color:var(--verde-ml)"><span>Desconto pela nota</span>'+
+      '<b style="color:var(--verde-ml)">− '+rs(eco)+'</b></div>' : '')+
+    '<div class="l"><span>Frete</span><b>'+
+      (entrega.tipo==='retira' ? '<span style="color:var(--verde-ml)">Grátis</span>'
+       : entrega.cotado ? rs(frete) : 'a cotar')+'</b></div>'+
+    '<div class="l"><span>Revisão e reencaixe</span>'+
+      '<b><span style="color:var(--verde-ml)">Grátis</span></b></div>';
+  $('carrTot').textContent=rs(soma);
+  $('bPagar').textContent = (pedido.length + (itemAtual?1:0))>1
+    ? 'Pagar os '+(pedido.length+(itemAtual?1:0))+' itens de uma vez'
+    : 'Ir para o pagamento';
+  if(pedido.length || itemAtual) $('carr').classList.add('on');
+  if($('cartLink')) $('cartLink').textContent='Carrinho ('+n+')';
+  window.dispatchEvent(new Event('dtf-cart-changed'));
+}
+
+function carrinho(){
+  const base=precoBase(nota), cob=cobrar(metros);
+  const unit=base, tot=cob*unit, sobra=+(cob-metros).toFixed(2);
+  $('carr').classList.add('on');
+  let l='<div class="l"><span>'+MODOS[modo].tit+'</span><b>'+rs(base)+'/m</b></div>';
+  {
+    const teto=TABELA[modo], eco=(teto-base)*cob;
+    l = '<div class="l"><span>'+MODOS[modo].tit+' · tabela</span><b>'+rs(teto)+'/m</b></div>';
+    l += eco>0.01
+      ? '<div class="l" style="color:#7FD4A0"><span>Desconto pela nota '+nota+'</span><b>−'+rs(eco)+'</b></div>'
+      : '<div class="l" style="color:#8D9AB0"><span>Nota '+nota+' · sem desconto</span><b>—</b></div>';
+  }
+  if(!ehFolha()) l += '<div class="l" style="color:#8D9AB0"><span>Montagem da folha</span>'+
+    '<b>inclusa · '+rs(MONTAGEM[modo])+'/m</b></div>';
+  l += '<div class="l"><span>Metragem'+(sobra>0.001?' · arredondada para 10 cm':'')+
+       '</span><b>'+fmtM(cob)+' m</b></div>';
+  l += '<div class="l"><span>Preço final do metro</span><b>'+rs(unit)+'</b></div>'+
+       '<div class="l" style="color:var(--laranja2)"><span>Revisão e reencaixe</span><b>grátis</b></div>';
+  $('carrLin').innerHTML=l;
+  $('atual').style.display='';
+  itemAtual={modo, tit:MODOS[modo].tit, nota, metros, cob, unit, total:tot,
+             localFiles:(ehFolha()?folhas:artes).map(x=>x.f),
+             desc:fmtM(cob)+' m · '+rs(unit)+'/m · nota '+nota};
+  pintaPedido();
+  previa();
+  if(nota<90){
+    const piso=pisoEscada(), ganho=(base-piso)*cob;
+    if(ganho>0.5) qm('<b>Dá para chegar ao melhor preço.</b> Corrigindo os pontos e chegando a 90, '+
+      'o metro cai para '+rs(piso)+' — são '+rs(ganho)+' a menos neste pedido.','var(--verde)');
+  }
+}
+function qm(t,c){ const m=$('qmsg'); m.style.display='block'; m.style.color=c||'var(--verde)'; m.innerHTML=t; }
+