feat(server+web+desktop): Phase 3.2-B Payple 결제 연동 + 대시보드 Premium 상태 표시

Payple PG 연동:
- _shared/payple.ts: Payple API 래퍼 (auth/billing/cancel/deleteBillingKey)
- payple-checkout Edge Function: 빌링키 결제 + 구독 활성화
- payple-webhook Edge Function: 결제완료/취소 이벤트
- payple-manage Edge Function: 구독 취소 (빌링키 해지)
- DB migration: payment_provider + payple_payer_id + payple_pay_oid
- 웹 billing 페이지: Payple JS SDK 결제창 + 관리 버튼 (Stripe 대체)
- Electron LicenseModal: shell.openExternal → 웹 결제 페이지

대시보드 Premium 상태:
- CrtDisplay services에 PREMIUM LLM LED 추가
- 백엔드 인디케이터 카드 (Local/Premium) + 티어 카드
- 사용량 섹션: 전 티어 표시 + 모델별 Premium 쿼터
- 12개 locale × 14개 i18n 키

apps/desktop/src/renderer/components/LicenseModal.tsx

@@ -83,9 +83,9 @@ export function LicenseModal({ open, onClose }: LicenseModalProps): React.ReactE
   const isFree = currentTier === 'free'
   const isPro = currentTier === 'pro'
 
-  const handleUpgrade = useCallback(() => {
-    alert(t('license.paymentPending'))
-  }, [t])
+  const handleUpgrade = useCallback((tier: 'pro' | 'pro_plus' = 'pro') => {
+    window.electronAPI.license.openBilling({ tier })
+  }, [])
 
   return (
     <Dialog
@@ -141,7 +141,7 @@ export function LicenseModal({ open, onClose }: LicenseModalProps): React.ReactE
 
             {isFree && (
               <>
-                <PhysicalButton onClick={handleUpgrade} sx={{ width: '100%' }}>
+                <PhysicalButton onClick={() => handleUpgrade('pro')} sx={{ width: '100%' }}>
                   <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                     <Led color="green" size={8} />
                     <PhosphorText variant="compact">
@@ -149,7 +149,7 @@ export function LicenseModal({ open, onClose }: LicenseModalProps): React.ReactE
                     </PhosphorText>
                   </Box>
                 </PhysicalButton>
-                <PhysicalButton onClick={handleUpgrade} sx={{ width: '100%' }}>
+                <PhysicalButton onClick={() => handleUpgrade('pro_plus')} sx={{ width: '100%' }}>
                   <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                     <Led color="green" size={8} />
                     <PhosphorText variant="compact">
@@ -168,7 +168,7 @@ export function LicenseModal({ open, onClose }: LicenseModalProps): React.ReactE
                     {t('license.currentPlan')} — {t('license.proPlan')}
                   </PhosphorText>
                 </Box>
-                <PhysicalButton onClick={handleUpgrade} sx={{ width: '100%' }}>
+                <PhysicalButton onClick={() => handleUpgrade('pro_plus')} sx={{ width: '100%' }}>
                   <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
                     <Led color="green" size={8} />
                     <PhosphorText variant="compact">