feat(desktop): linkify 'Nous portal' in the cloud no-agents message

When Hermes Cloud discovery returns zero agents, the empty-state message now
renders 'Nous portal' as a hyperlink to https://portal.nousresearch.com/agents
(opened via the app's ExternalLink → shell.openExternal), so the user can jump
straight to creating an agent instead of finding the portal manually.

The cloudNoAgents i18n string becomes { before, linkText, after } (en + zh) so
each locale controls link placement; ja/zh-hant fall back to en via defineLocale.
No external-link icon on this inline link to keep the sentence clean.

tsc + eslint clean; link verified present in the packaged renderer bundle.

apps/desktop/src/app/settings/gateway-settings.tsx

@@ -10,6 +10,7 @@ import type {
   DesktopConnectionProbeResult
 } from '@/global'
 import { useI18n } from '@/i18n'
+import { ExternalLink } from '@/lib/external-link'
 import { AlertCircle, Check, Cloud, FileText, Globe, Loader2, LogIn, Monitor, RefreshCw } from '@/lib/icons'
 import { cn } from '@/lib/utils'
 import { notify, notifyError } from '@/store/notifications'
@@ -795,7 +796,13 @@ export function GatewaySettings() {
               ) : cloudAgents.length === 0 ? (
                 <div className="flex items-start gap-2 py-3 text-[length:var(--conversation-caption-font-size)] text-(--ui-text-tertiary)">
                   <AlertCircle className="mt-0.5 size-4 shrink-0" />
-                  {g.cloudNoAgents}
+                  <span>
+                    {g.cloudNoAgents.before}
+                    <ExternalLink href="https://portal.nousresearch.com/agents" showExternalIcon={false}>
+                      {g.cloudNoAgents.linkText}
+                    </ExternalLink>
+                    {g.cloudNoAgents.after}
+                  </span>
                 </div>
               ) : (
                 <div className="grid gap-1">

apps/desktop/src/i18n/en.ts

@@ -545,7 +545,11 @@ export const en: Translations = {
       cloudOrgChange: 'Change org',
       cloudOrgRole: role => `Role: ${role}`,
       cloudLoadingAgents: 'Loading your agents…',
-      cloudNoAgents: 'No agents found on this account. Create one in the Nous portal, then refresh.',
+      cloudNoAgents: {
+        before: 'No agents found on this account. Create one in the ',
+        linkText: 'Nous portal',
+        after: ', then refresh.'
+      },
       cloudRefresh: 'Refresh',
       cloudConnect: 'Connect',
       cloudConnecting: 'Connecting…',

apps/desktop/src/i18n/types.ts

@@ -456,7 +456,7 @@ export interface Translations {
       cloudOrgChange: string
       cloudOrgRole: (role: string) => string
       cloudLoadingAgents: string
-      cloudNoAgents: string
+      cloudNoAgents: { before: string; linkText: string; after: string }
       cloudRefresh: string
       cloudConnect: string
       cloudConnecting: string

apps/desktop/src/i18n/zh.ts

@@ -734,7 +734,11 @@ export const zh: Translations = {
       cloudOrgChange: '切换组织',
       cloudOrgRole: role => `角色：${role}`,
       cloudLoadingAgents: '正在加载你的智能体…',
-      cloudNoAgents: '此账户下未找到智能体。请在 Nous 门户中创建一个，然后刷新。',
+      cloudNoAgents: {
+        before: '此账户下未找到智能体。请在',
+        linkText: 'Nous 门户',
+        after: '中创建一个，然后刷新。'
+      },
       cloudRefresh: '刷新',
       cloudConnect: '连接',
       cloudConnecting: '正在连接…',