refactor: resilient integration queries + simplification

- Extract settleIntegrationQueries helper (Promise.allSettled + logging)
  so one failing integration no longer kills the entire widget
- Convert 16 widget routers from Promise.all to settleIntegrationQueries
- Add onSettled query invalidation to downloads and media-requests mutations
- Inline 4 single-use firewall useUpdating* hooks
- Deduplicate firewall router (4 identical procedures → shared factory)
- Fix system-resources chart duplicate initial point (ref-based dedup)
- Simplify docker table refresh (refetch + isFetching, drop manual state)
- Trim invalidateIntegrationCacheAsync to session-store only (dead scan)
- Fix Beszel getAlerts: inner Promise.allSettled so systems failure
  doesn't discard alerts

packages/api/src/router/widgets/notifications.ts

@@ -3,6 +3,7 @@ import { notificationsRequestHandler } from "@homarr/request-handler/notificatio
 
 import type { IntegrationAction } from "../../middlewares/integration";
 import { createManyIntegrationMiddleware } from "../../middlewares/integration";
+import { settleIntegrationQueries } from "../../settle-integrations";
 import { createTRPCRouter, publicProcedure } from "../../trpc";
 
 const createNotificationsIntegrationMiddleware = (action: IntegrationAction) =>
@@ -12,21 +13,19 @@ export const notificationsRouter = createTRPCRouter({
   getNotifications: publicProcedure
     .unstable_concat(createNotificationsIntegrationMiddleware("query"))
     .query(async ({ ctx }) => {
-      return await Promise.all(
-        ctx.integrations.map(async (integration) => {
-          const innerHandler = notificationsRequestHandler.handler(integration, {});
-          const { data, timestamp } = await innerHandler.getDataAsync();
+      return await settleIntegrationQueries(ctx.integrations, async (integration) => {
+        const innerHandler = notificationsRequestHandler.handler(integration, {});
+        const { data, timestamp } = await innerHandler.getDataAsync();
 
-          return {
-            integration: {
-              id: integration.id,
-              name: integration.name,
-              kind: integration.kind,
-              updatedAt: timestamp,
-            },
-            data,
-          };
-        }),
-      );
+        return {
+          integration: {
+            id: integration.id,
+            name: integration.name,
+            kind: integration.kind,
+            updatedAt: timestamp,
+          },
+          data,
+        };
+      });
     }),
 });