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/(pages)/dashboard/_components/continue-watching-card.tsx

@@ -1,5 +1,3 @@
-"use client";
-
 import { IconPlayerPlay } from "@tabler/icons-react";
 import Image from "next/image";
 import Link from "next/link";

app/(pages)/dashboard/_components/continue-watching-list.tsx

@@ -1,5 +1,3 @@
-"use client";
-
 import {
   Carousel,
   CarouselContent,

app/(pages)/dashboard/_components/feed-section.tsx

@@ -1,5 +1,3 @@
-"use client";
-
 import type { ReactNode } from "react";
 
 export function FeedSection({