frontend: refresh gateway status after tools/config save

- ToolsPage: call refreshGatewayState after tool toggle success
- ConfigPage: call refreshGatewayState after config save success
- RawConfigPage: call refreshGatewayState after raw JSON save success
- Ensures restart-required indicator updates immediately after changes

web/frontend/src/components/config/config-page.tsx

@@ -32,6 +32,7 @@ import {
 } from "@/components/config/form-model"
 import { PageHeader } from "@/components/page-header"
 import { Button } from "@/components/ui/button"
+import { refreshGatewayState } from "@/store/gateway"
 
 export function ConfigPage() {
   const { t } = useTranslation()
@@ -280,6 +281,7 @@ export function ConfigPage() {
       }
 
       toast.success(t("pages.config.save_success"))
+      void refreshGatewayState({ force: true })
     } catch (err) {
       toast.error(
         err instanceof Error ? err.message : t("pages.config.save_error"),

web/frontend/src/components/config/raw-config-page.tsx

@@ -19,6 +19,7 @@ import {
 } from "@/components/ui/alert-dialog"
 import { Button } from "@/components/ui/button"
 import { Textarea } from "@/components/ui/textarea"
+import { refreshGatewayState } from "@/store/gateway"
 
 export function RawConfigPage() {
   const { t } = useTranslation()
@@ -56,6 +57,7 @@ export function RawConfigPage() {
       } catch {
         queryClient.invalidateQueries({ queryKey: ["config"] })
       }
+      void refreshGatewayState({ force: true })
     },
     onError: () => {
       toast.error(t("pages.config.save_error"))

web/frontend/src/components/tools/tools-page.tsx

@@ -14,6 +14,7 @@ import {
   CardTitle,
 } from "@/components/ui/card"
 import { cn } from "@/lib/utils"
+import { refreshGatewayState } from "@/store/gateway"
 
 export function ToolsPage() {
   const { t } = useTranslation()
@@ -33,6 +34,7 @@ export function ToolsPage() {
           : t("pages.agent.tools.disable_success"),
       )
       void queryClient.invalidateQueries({ queryKey: ["tools"] })
+      void refreshGatewayState({ force: true })
     },
     onError: (err) => {
       toast.error(