feat(nav): menu "Cadastro" agrupando Empresas/Produtos/Revendas/Clientes

Empresas, Produtos (com toda a árvore de submenus), Revendas e Clientes
saem do nível 1 do menu e passam a viver dentro de um novo item
"Cadastro". Isso exercita 3 níveis de submenu aninhado pela primeira
vez (Cadastro > Produtos > Grupos > Subgrupos) — a recursão do AppShell
já suportava isso estruturalmente, mas estava documentada como não
testada; verificado ao vivo via Playwright que funciona corretamente
(auto-expande só o caminho ativo em cada nível).

Suíte: 95/95. pnpm turbo run typecheck build: 28/28.

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

apps/core-web/src/routes/AuthenticatedLayout.tsx

@@ -45,31 +45,38 @@ function withActive(items: NavItemDef[], pathname: string): AppShellNavItem[] {
 
 const NAV_ITEM_DEFS: NavItemDef[] = [
   { key: "dashboard", label: "Painel", href: "/" },
-  { key: "companies", label: "Empresas", href: "/companies" },
   {
-    key: "products",
-    label: "Produtos",
-    href: "/products",
+    key: "registration",
+    label: "Cadastro",
+    href: "/companies",
     children: [
-      { key: "products-list", label: "Itens", href: "/products" },
-      { key: "products-types", label: "Tipos", href: "/products/types" },
+      { key: "companies", label: "Empresas", href: "/companies" },
       {
-        key: "products-groups",
-        label: "Grupos",
-        href: "/products/groups",
+        key: "products",
+        label: "Produtos",
+        href: "/products",
         children: [
-          { key: "products-groups-list", label: "Grupos", href: "/products/groups" },
-          { key: "products-subgroups", label: "Subgrupos", href: "/products/subgroups" },
+          { key: "products-list", label: "Itens", href: "/products" },
+          { key: "products-types", label: "Tipos", href: "/products/types" },
+          {
+            key: "products-groups",
+            label: "Grupos",
+            href: "/products/groups",
+            children: [
+              { key: "products-groups-list", label: "Grupos", href: "/products/groups" },
+              { key: "products-subgroups", label: "Subgrupos", href: "/products/subgroups" },
+            ],
+          },
+          { key: "products-brands", label: "Marcas", href: "/products/brands" },
+          { key: "products-units", label: "Unidades", href: "/products/units" },
         ],
       },
-      { key: "products-brands", label: "Marcas", href: "/products/brands" },
-      { key: "products-units", label: "Unidades", href: "/products/units" },
+      { key: "resellers", label: "Revendas", href: "/resellers" },
+      { key: "client-registrations", label: "Clientes", href: "/client-registrations" },
     ],
   },
-  { key: "resellers", label: "Revendas", href: "/resellers" },
   { key: "leads", label: "CRM", href: "/leads" },
   { key: "quotes", label: "Ofertas", href: "/quotes" },
-  { key: "client-registrations", label: "Clientes", href: "/client-registrations" },
   { key: "contracts", label: "Contratos", href: "/contracts" },
   { key: "documents", label: "Documentos", href: "/documents/templates" },
   { key: "signatures", label: "Assinaturas", href: "/signatures" },