fix(desktop): rename "Restart messaging" -> "Restart gateway"

The Command Center control restarts the whole messaging gateway, yet was
labelled "Restart messaging" while the status line above it reads "Messaging
gateway running/stopped". Rename the i18n key to match what it does, across
all 4 locales.

apps/desktop/src/app/command-center/index.tsx

@@ -395,7 +395,7 @@ export function CommandCenterView({ initialSection, onClose, onDeleteSession, on
                       </div>
                       <div className="flex shrink-0 items-center gap-1.5 whitespace-nowrap">
                         <Button onClick={() => void runSystemAction('restart')} size="xs" variant="text">
-                          {cc.restartMessaging}
+                          {cc.restartGateway}
                         </Button>
                         <Button onClick={() => void runSystemAction('update')} size="xs" variant="textStrong">
                           {cc.updateHermes}

apps/desktop/src/i18n/en.ts

@@ -761,7 +761,7 @@ export const en: Translations = {
     gatewayRunning: 'Messaging gateway running',
     gatewayStopped: 'Messaging gateway stopped',
     hermesActiveSessions: (version, count) => `Hermes ${version} · Active sessions ${count}`,
-    restartMessaging: 'Restart messaging',
+    restartGateway: 'Restart gateway',
     updateHermes: 'Update Hermes',
     actionRunning: 'running',
     actionDone: 'done',

apps/desktop/src/i18n/ja.ts

@@ -881,7 +881,7 @@ export const ja = defineLocale({
     gatewayRunning: 'メッセージングゲートウェイが実行中',
     gatewayStopped: 'メッセージングゲートウェイが停止中',
     hermesActiveSessions: (version, count) => `Hermes ${version} · アクティブセッション ${count}`,
-    restartMessaging: 'メッセージングを再起動',
+    restartGateway: 'ゲートウェイを再起動',
     updateHermes: 'Hermes を更新',
     actionRunning: '実行中',
     actionDone: '完了',

apps/desktop/src/i18n/types.ts

@@ -625,7 +625,7 @@ export interface Translations {
     gatewayRunning: string
     gatewayStopped: string
     hermesActiveSessions: (version: string, count: number) => string
-    restartMessaging: string
+    restartGateway: string
     updateHermes: string
     actionRunning: string
     actionDone: string

apps/desktop/src/i18n/zh-hant.ts

@@ -854,7 +854,7 @@ export const zhHant = defineLocale({
     gatewayRunning: '訊息閘道執行中',
     gatewayStopped: '訊息閘道已停止',
     hermesActiveSessions: (version, count) => `Hermes ${version} · 活躍工作階段 ${count}`,
-    restartMessaging: '重新啟動訊息服務',
+    restartGateway: '重新啟動閘道',
     updateHermes: '更新 Hermes',
     actionRunning: '執行中',
     actionDone: '完成',

apps/desktop/src/i18n/zh.ts

@@ -951,7 +951,7 @@ export const zh: Translations = {
     gatewayRunning: '消息网关运行中',
     gatewayStopped: '消息网关已停止',
     hermesActiveSessions: (version, count) => `Hermes ${version} · 活跃会话 ${count}`,
-    restartMessaging: '重启消息服务',
+    restartGateway: '重启网关',
     updateHermes: '更新 Hermes',
     actionRunning: '运行中',
     actionDone: '完成',