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/data-table-column-header.tsx

@@ -0,0 +1,65 @@
+"use client"
+
+import type React from "react"
+
+import { ArrowDownIcon, ArrowUpIcon, CaretSortIcon, EyeNoneIcon } from "@radix-ui/react-icons"
+import type { Column } from "@tanstack/react-table"
+
+import { cn } from "@/lib/utils"
+import { Button } from "@/components/ui/button"
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu"
+
+interface DataTableColumnHeaderProps<TData, TValue> extends React.HTMLAttributes<HTMLDivElement> {
+  column: Column<TData, TValue>
+  title: string
+}
+
+export function DataTableColumnHeader<TData, TValue>({
+  column,
+  title,
+  className,
+}: DataTableColumnHeaderProps<TData, TValue>) {
+  if (!column.getCanSort()) {
+    return <div className={cn(className)}>{title}</div>
+  }
+
+  return (
+    <div className={cn("flex items-center space-x-2", className)}>
+      <DropdownMenu>
+        <DropdownMenuTrigger asChild>
+          <Button variant="ghost" size="sm" className="-ml-3 h-8 data-[state=open]:bg-accent">
+            <span>{title}</span>
+            {column.getIsSorted() === "desc" ? (
+              <ArrowDownIcon className="ml-2 h-4 w-4" />
+            ) : column.getIsSorted() === "asc" ? (
+              <ArrowUpIcon className="ml-2 h-4 w-4" />
+            ) : (
+              <CaretSortIcon className="ml-2 h-4 w-4" />
+            )}
+          </Button>
+        </DropdownMenuTrigger>
+        <DropdownMenuContent align="start">
+          <DropdownMenuItem onClick={() => column.toggleSorting(false)}>
+            <ArrowUpIcon className="mr-2 h-3.5 w-3.5 text-muted-foreground/70" />
+            Crescente
+          </DropdownMenuItem>
+          <DropdownMenuItem onClick={() => column.toggleSorting(true)}>
+            <ArrowDownIcon className="mr-2 h-3.5 w-3.5 text-muted-foreground/70" />
+            Decrescente
+          </DropdownMenuItem>
+          <DropdownMenuSeparator />
+          <DropdownMenuItem onClick={() => column.toggleVisibility(false)}>
+            <EyeNoneIcon className="mr-2 h-3.5 w-3.5 text-muted-foreground/70" />
+            Ocultar
+          </DropdownMenuItem>
+        </DropdownMenuContent>
+      </DropdownMenu>
+    </div>
+  )
+}