feat(license): show Instance ID with copy on settings + ProGate

Always return machine fingerprint instanceId from license status for
offline LICOFF- binding. Shared InstanceIdRow (zh/en) above activate.

backend/services/license.go

@@ -306,14 +306,17 @@ func deriveInvalidReason(lic *models.License) string {
 
 // LicenseStatusPayload 给前端：始终带回库存证的 sanitized + 是否有效 Pro。
 // 无效时带 invalidReason（expired|over_instance|revoked），且不清 LicenseKey。
+// instanceId 始终返回本机指纹（DATA_DIR/instance.id），供离线 LICOFF- 绑码展示。
 func LicenseStatusPayload() (map[string]interface{}, bool) {
 	RefreshOpsxLicenseIfDue()
 	current := CurrentLicense()
 	stored := StoredLicense()
+	instanceID := GetOrCreateInstanceID()
 	if stored == nil {
-		return map[string]interface{}{"plan": "free"}, false
+		return map[string]interface{}{"plan": "free", "instanceId": instanceID}, false
 	}
 	out := stored.Sanitized()
+	out["instanceId"] = instanceID
 	if current != nil {
 		delete(out, "invalidReason")
 		return out, true

frontend/src/components/InstanceIdRow.tsx

@@ -0,0 +1,39 @@
+import { memo, useCallback } from 'react'
+import { useTranslation } from 'react-i18next'
+import { Copy } from 'lucide-react'
+import { toast } from 'sonner'
+import { Button } from '@/components/ui/button'
+
+type Props = {
+  instanceId?: string | null
+}
+
+/** 实例 ID 展示行：设置授权区与 ProGate 共用；全文 + 一键复制，无 PII。 */
+export const InstanceIdRow = memo(function InstanceIdRow({ instanceId }: Props) {
+  const { t } = useTranslation('license')
+  const id = instanceId?.trim() || ''
+
+  const onCopy = useCallback(() => {
+    if (!id) return
+    void navigator.clipboard?.writeText(id).then(
+      () => toast.success(t('instanceIdCopied')),
+      () => toast.error(t('instanceIdCopyFailed')),
+    )
+  }, [id, t])
+
+  if (!id) return null
+
+  return (
+    <div className="space-y-1">
+      <div className="flex flex-wrap items-start gap-2">
+        <span className="shrink-0 pt-0.5 text-sm text-muted-foreground">{t('instanceId')}</span>
+        <code className="min-w-0 flex-1 break-all font-mono text-sm">{id}</code>
+        <Button type="button" size="sm" variant="outline" className="shrink-0 gap-1" onClick={onCopy}>
+          <Copy className="size-3.5" />
+          {t('copy')}
+        </Button>
+      </div>
+      <p className="text-xs text-muted-foreground">{t('instanceIdHint')}</p>
+    </div>
+  )
+})

frontend/src/components/ProGate.tsx

@@ -6,6 +6,7 @@ import { toast } from 'sonner'
 import { Button } from '@/components/ui/button'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
 import { Input } from '@/components/ui/input'
+import { InstanceIdRow } from '@/components/InstanceIdRow'
 import { LicenseStatusBanners } from '@/components/LicenseStatusBanners'
 import { licenseApi } from '@/api/license'
 import { useLicense } from '@/hooks/useLicense'
@@ -41,6 +42,7 @@ export const ProGate = memo(function ProGate({ featureKey }: { featureKey: strin
   return (
     <div className="mx-auto max-w-2xl space-y-4 pt-8">
       <LicenseStatusBanners info={info} pro={pro} onAction={focusKey} />
+      <InstanceIdRow instanceId={info?.instanceId} />
       <Card>
         <CardHeader className="pb-3">
           <CardTitle className="flex items-center gap-2 text-base">
@@ -71,16 +73,19 @@ export const ProGate = memo(function ProGate({ featureKey }: { featureKey: strin
               <p className="mt-1 text-xs text-muted-foreground">{t('pricing.teamDesc')}</p>
             </div>
           </div>
-          <div className="flex gap-2">
-            <Input
-              ref={inputRef}
-              value={key}
-              onChange={e => setKey(e.target.value)}
-              placeholder={t('gate.keyPlaceholder')}
-              className="font-mono text-sm"
-            />
-            <Button onClick={() => void activate()} disabled={activating || !key.trim()}>{t('gate.activate')}</Button>
-            <Button variant="outline" onClick={() => navigate('/settings')}>{t('gate.toSettings')}</Button>
+          <div className="space-y-2">
+            <p className="text-xs text-muted-foreground">{t('activateHint')}</p>
+            <div className="flex gap-2">
+              <Input
+                ref={inputRef}
+                value={key}
+                onChange={e => setKey(e.target.value)}
+                placeholder={t('gate.keyPlaceholder')}
+                className="font-mono text-sm"
+              />
+              <Button onClick={() => void activate()} disabled={activating || !key.trim()}>{t('gate.activate')}</Button>
+              <Button variant="outline" onClick={() => navigate('/settings')}>{t('gate.toSettings')}</Button>
+            </div>
           </div>
           <p className="text-xs text-muted-foreground">{t('gate.freeHint')}</p>
         </CardContent>

frontend/src/i18n/locales/en/license.ts

@@ -7,6 +7,12 @@ export default {
   expiry: 'Valid until',
   customer: 'Licensed to',
   instances: 'Instance limit',
+  instanceId: 'Instance ID',
+  instanceIdHint: 'Provide this ID for offline licensing. Machine fingerprint only — no personal data.',
+  instanceIdCopied: 'Instance ID copied',
+  instanceIdCopyFailed: 'Copy failed — select manually',
+  copy: 'Copy',
+  activateHint: 'Online keys start with LIC-; offline LICOFF- keys must bind the Instance ID above',
   permanent: 'perpetual',
   personalTitle: 'Personal',
   teamTitle: 'Team',

frontend/src/i18n/locales/zh/license.ts

@@ -7,6 +7,12 @@ export default {
   expiry: '有效期',
   customer: '授权对象',
   instances: '实例上限',
+  instanceId: '实例 ID',
+  instanceIdHint: '离线授权需提供此 ID；仅本机指纹，不含个人信息',
+  instanceIdCopied: '实例 ID 已复制',
+  instanceIdCopyFailed: '复制失败，请手动选择',
+  copy: '复制',
+  activateHint: '在线码以 LIC- 开头；离线码 LICOFF-，须与上方实例 ID 绑定',
   permanent: '永久',
   personalTitle: '个人版',
   teamTitle: '团队版',

frontend/src/pages/settings/components/LicenseSection.tsx

@@ -6,6 +6,7 @@ import { Button } from '@/components/ui/button'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
 import { Input } from '@/components/ui/input'
 import { KeyRound } from 'lucide-react'
+import { InstanceIdRow } from '@/components/InstanceIdRow'
 import { LicenseStatusBanners } from '@/components/LicenseStatusBanners'
 import { licenseApi } from '@/api/license'
 import { useLicense } from '@/hooks/useLicense'
@@ -61,6 +62,7 @@ export const LicenseSection = memo(function LicenseSection() {
       </CardHeader>
       <CardContent className="space-y-4">
         <LicenseStatusBanners info={info} pro={pro} onAction={isAdmin ? focusKey : undefined} />
+        <InstanceIdRow instanceId={info?.instanceId} />
         <div className="text-sm">
           {pro ? (
             <div className="grid gap-1 text-muted-foreground sm:grid-cols-2">
@@ -76,17 +78,20 @@ export const LicenseSection = memo(function LicenseSection() {
           )}
         </div>
         {isAdmin && (
-          <div className="flex gap-2">
-            <Input
-              ref={inputRef}
-              value={key}
-              onChange={e => setKey(e.target.value)}
-              placeholder={t('keyPlaceholder')}
-              className="font-mono text-sm"
-            />
-            <Button onClick={() => void activate()} disabled={activating || !key.trim()}>
-              {activating ? t('activating') : t('activate')}
-            </Button>
+          <div className="space-y-2">
+            <p className="text-xs text-muted-foreground">{t('activateHint')}</p>
+            <div className="flex gap-2">
+              <Input
+                ref={inputRef}
+                value={key}
+                onChange={e => setKey(e.target.value)}
+                placeholder={t('keyPlaceholder')}
+                className="font-mono text-sm"
+              />
+              <Button onClick={() => void activate()} disabled={activating || !key.trim()}>
+                {activating ? t('activating') : t('activate')}
+              </Button>
+            </div>
           </div>
         )}
       </CardContent>