feat: initial commit — asaas-checkout template white-label

Template genérico de checkout com ASAAS, parametrizado via env vars.
Inclui fluxo completo: checkout → pedido → polling → webhook → admin.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/icons.tsx

@@ -0,0 +1,60 @@
+import {
+  AlertTriangle,
+  ArrowRight,
+  Check,
+  ChevronLeft,
+  ChevronRight,
+  Command,
+  CreditCard,
+  File,
+  FileText,
+  Github,
+  HelpCircle,
+  Image,
+  Laptop,
+  Loader2,
+  Moon,
+  MoreVertical,
+  Pizza,
+  Plus,
+  Settings,
+  SunMedium,
+  Trash,
+  Twitter,
+  User,
+  X,
+  type LucideIcon,
+} from "lucide-react"
+
+import { Apple, Google } from "@/components/brand-icons"
+
+export type Icon = LucideIcon
+
+export const Icons = {
+  logo: Command,
+  close: X,
+  spinner: Loader2,
+  chevronLeft: ChevronLeft,
+  chevronRight: ChevronRight,
+  trash: Trash,
+  post: FileText,
+  page: File,
+  media: Image,
+  settings: Settings,
+  billing: CreditCard,
+  ellipsis: MoreVertical,
+  add: Plus,
+  warning: AlertTriangle,
+  user: User,
+  arrowRight: ArrowRight,
+  help: HelpCircle,
+  pizza: Pizza,
+  sun: SunMedium,
+  moon: Moon,
+  laptop: Laptop,
+  gitHub: Github,
+  twitter: Twitter,
+  check: Check,
+  google: Google,
+  apple: Apple,
+}