feat: update chat URLs and paths from /kefu to /support for consistency

web/app/support/chat/page.tsx

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+import { KefuChatShell } from "@/components/kefu/chat-shell"
+
+export default function Page() {
+  return <KefuChatShell />
+}

web/app/support/closed/page.tsx

@@ -0,0 +1,25 @@
+"use client"
+
+import { CheckCircle2Icon } from "lucide-react"
+
+import { useI18n } from "@/i18n/provider"
+
+export default function Page() {
+  const t = useI18n()
+
+  return (
+    <main className="flex min-h-svh items-center justify-center bg-muted px-6 text-foreground">
+      <section className="grid max-w-sm justify-items-center gap-4 text-center">
+        <div className="flex size-14 items-center justify-center rounded-full bg-emerald-50 text-emerald-600 ring-1 ring-emerald-100 dark:bg-emerald-950/40 dark:text-emerald-300 dark:ring-emerald-900">
+          <CheckCircle2Icon className="size-7" />
+        </div>
+        <div className="grid gap-2">
+          <h1 className="text-lg font-semibold text-foreground">{t("kefu.closedTitle")}</h1>
+          <p className="text-sm leading-6 text-muted-foreground">
+            {t("kefu.closedDescription")}
+          </p>
+        </div>
+      </section>
+    </main>
+  )
+}

web/app/support/page.tsx

@@ -0,0 +1,6 @@
+import { KefuWidgetDemo } from "@/components/kefu/widget-demo"
+
+export default function Page() {
+  return <KefuWidgetDemo />
+}
+