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)/accounts/[accountId]/statement/page.tsx

@@ -1,5 +1,6 @@
 import { RiPencilLine } from "@remixicon/react";
 import { notFound } from "next/navigation";
+import { connection } from "next/server";
 import { AccountDialog } from "@/features/accounts/components/account-dialog";
 import { AccountStatementCard } from "@/features/accounts/components/account-statement-card";
 import type { Account } from "@/features/accounts/components/types";
@@ -42,6 +43,7 @@ const capitalize = (value: string) =>
 	value.length > 0 ? value[0]?.toUpperCase().concat(value.slice(1)) : value;
 
 export default async function Page({ params, searchParams }: PageProps) {
+	await connection();
 	const { accountId } = await params;
 	const userId = await getUserId();
 	const resolvedSearchParams = searchParams ? await searchParams : undefined;

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

@@ -1,8 +1,10 @@
+import { connection } from "next/server";
 import { AccountsPage } from "@/features/accounts/components/accounts-page";
 import { fetchAllAccountsForUser } from "@/features/accounts/queries";
 import { getUserId } from "@/shared/lib/auth/server";
 
 export default async function Page() {
+	await connection();
 	const userId = await getUserId();
 	const { activeAccounts, archivedAccounts, logoOptions } =
 		await fetchAllAccountsForUser(userId);