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>

app/api/agendamento/[id]/status/route.ts

@@ -0,0 +1,28 @@
+import { NextResponse } from "next/server"
+import { createServiceClient } from "@/lib/supabase"
+
+export async function PATCH(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params
+  const body = await request.json().catch(() => ({}))
+  const { status } = body as { status?: string }
+
+  const STATUSES_VALIDOS = ["pendente", "confirmado", "realizado", "cancelado"]
+  if (!status || !STATUSES_VALIDOS.includes(status)) {
+    return NextResponse.json({ error: "Status inválido" }, { status: 400 })
+  }
+
+  const supabase = createServiceClient()
+  const { error } = await supabase
+    .from("agendamentos")
+    .update({ status, updated_at: new Date().toISOString() })
+    .eq("id", id)
+
+  if (error) {
+    return NextResponse.json({ error: error.message }, { status: 500 })
+  }
+
+  return NextResponse.json({ ok: true, status })
+}