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

packages/i18n/src/locales/th.json

@@ -36,6 +36,16 @@
   "dashboard.entries": "{{count}} รายการ",
   "dashboard.stat": "สถิติ",
   "dashboard.sys": "ระบบ",
+  "dashboard.currentBackend": "แบ็กเอนด์ปัจจุบัน",
+  "dashboard.backendLocal": "ภายในเครื่อง (Ollama)",
+  "dashboard.backendPremium": "พรีเมียม (Claude)",
+  "dashboard.loginRequired": "ต้องเข้าสู่ระบบ",
+  "dashboard.premiumQuota": "โควต้าพรีเมียม",
+  "dashboard.modelHaiku": "Haiku",
+  "dashboard.modelSonnet": "Sonnet",
+  "dashboard.modelOpus": "Opus",
+  "dashboard.quotaWeekly": "รายสัปดาห์",
+  "dashboard.quotaDaily": "รายวัน",
   "history.title": "ประวัติการถอดความ",
   "history.search": "ค้นหา...",
   "history.entries": "{{count}} รายการ",
@@ -185,6 +195,8 @@
   "service.offline": "OFFLINE",
   "service.active": "ACTIVE",
   "service.standby": "STANDBY",
+  "service.premiumLlm": "PREMIUM LLM",
+  "service.notConfigured": "NOT SET",
   "common.cancel": "ยกเลิก",
   "common.save": "บันทึก",
   "common.delete": "ลบ",