perf(cache): migração para diretiva use cache do Next.js

Todas as queries cacheadas do dashboard migram de `unstable_cache` para
a diretiva `use cache` com `cacheTag` e `cacheLife({ revalidate: 3 })`.

Todas as páginas e o layout do dashboard passam a chamar `connection()`
para garantir renderização dinâmica. O root layout envolve os filhos em
`<Suspense>`. `next.config.ts` remove `turbopackFileSystemCacheForDev`
e adota `cacheComponents: true`.

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

src/app/(dashboard)/payers/[payerId]/page.tsx

@@ -4,6 +4,7 @@ import {
 	RiWallet3Line,
 } from "@remixicon/react";
 import { notFound } from "next/navigation";
+import { connection } from "next/server";
 import { PayerCardUsageCard } from "@/features/payers/components/details/payer-card-usage-card";
 import { PayerHeaderCard } from "@/features/payers/components/details/payer-header-card";
 import { PayerHistoryCard } from "@/features/payers/components/details/payer-history-card";
@@ -91,6 +92,7 @@ const createEmptySlugMaps = (): SlugMaps => ({
 type OptionSet = ReturnType<typeof buildOptionSets>;
 
 export default async function Page({ params, searchParams }: PageProps) {
+	await connection();
 	const { payerId } = await params;
 	const userId = await getUserId();
 	const resolvedSearchParams = searchParams ? await searchParams : undefined;

src/app/(dashboard)/payers/page.tsx

@@ -1,8 +1,10 @@
+import { connection } from "next/server";
 import { PayersPage } from "@/features/payers/components/payers-page";
 import { fetchPayersForUser } from "@/features/payers/queries";
 import { getUserId } from "@/shared/lib/auth/server";
 
 export default async function Page() {
+	await connection();
 	const userId = await getUserId();
 	const { payers, avatarOptions } = await fetchPayersForUser(userId);