Replace Jotai atoms with local state, add Suspense for PPR compatibility

- Delete filterable-row, backup-schedule, integrations, and system-health
  atom files; replace with useState/useTransition + server action calls
- Replace /api/explore/discover route with discoverByGenre server action;
  refactor FilterableTitleRow to call it directly via useTransition
- Wrap PagesLayout and AuthLayout children in Suspense to fix dynamic
  rendering errors during PPR static generation; remove StoreProvider
- Sequence ExplorePage session fetch before TMDB calls to prevent
  build-time requests during static generation
- Drop unnecessary "use client" directives from dashboard and person
  components that have no client-side hooks or browser API usage
- Improve Dockerfile: add bun install layer cache mount, copy
  .next/cache from builder, reorder ENV declarations

app/(auth)/setup/page.tsx

@@ -3,7 +3,11 @@ import { connection } from "next/server";
 import { isTmdbConfigured } from "@/lib/config";
 import { SetupForm } from "./_components/setup-form";
 
-export default async function SetupPage() {
+export default function SetupPage() {
+  return <SetupContent />;
+}
+
+async function SetupContent() {
   await connection();
   if (isTmdbConfigured()) redirect("/");
   return <SetupForm />;