feat: replace server-side Redis caching with TanStack Query AsyncStoragePersister

Consolidate two overlapping cache systems (broken TanStack persister + per-query Redis hash + pub/sub) into one: TanStack Query as single source of truth with Redis as its persistence layer via createAsyncStoragePersister.

- Replace QueryClientProvider with PersistQueryClientProvider backed by Redis
- Set global query defaults (staleTime: 0, refetchInterval: 30s, gcTime: 24h)
- Remove all per-widget staleTime/refetchInterval/retry/refetchOnWindowFocus overrides
- Replace cached request handlers with simplified fetch-only versions
- Remove all tRPC subscription procedures and useSubscription calls in favor of polling
- Delete 20 cron jobs that only pre-warmed server-side cache
- Simplify Redis from per-query hash to single blob per user+board

packages/request-handler/src/network-controller.ts

@@ -1,12 +1,11 @@
-import dayjs from "dayjs";
 
 import type { IntegrationKindByCategory } from "@homarr/definitions";
 import { createIntegrationAsync } from "@homarr/integrations";
 import type { NetworkControllerSummary } from "@homarr/integrations/types";
 
-import { createCachedIntegrationRequestHandler } from "./lib/cached-integration-request-handler";
+import { createIntegrationRequestHandler } from "./lib/integration-request-handler";
 
-export const networkControllerRequestHandler = createCachedIntegrationRequestHandler<
+export const networkControllerRequestHandler = createIntegrationRequestHandler<
   NetworkControllerSummary,
   IntegrationKindByCategory<"networkController">,
   Record<string, never>
@@ -15,6 +14,5 @@ export const networkControllerRequestHandler = createCachedIntegrationRequestHan
     const integrationInstance = await createIntegrationAsync(integration);
     return await integrationInstance.getNetworkSummaryAsync();
   },
-  cacheDuration: dayjs.duration(5, "minutes"),
   queryKey: "networkControllerSummary",
 });