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

server/supabase/functions/payple-manage/index.ts

@@ -0,0 +1,99 @@
+// server/supabase/functions/payple-manage/index.ts
+// Payple 구독 관리 — 취소 (빌링키 해지 + tier 다운그레이드)
+// stripe-portal 대체.
+// verify_jwt = false (requireUser로 직접 인증)
+
+import { corsHeaders, handleCorsPreflightRequest } from '../_shared/cors.ts'
+import { requireUser, authErrorResponse, type AuthError } from '../_shared/auth.ts'
+import { createServiceRoleClient } from '../_shared/quota.ts'
+import {
+  getPaypleConfig,
+  paypleAuth,
+  paypleDeleteBillingKey,
+} from '../_shared/payple.ts'
+
+interface ManageRequest {
+  action: 'cancel' | 'info'
+}
+
+function jsonResponse(body: Record<string, unknown>, status = 200): Response {
+  return new Response(JSON.stringify(body), {
+    status,
+    headers: { ...corsHeaders, 'Content-Type': 'application/json' },
+  })
+}
+
+// @ts-expect-error — Deno 런타임 전역
+Deno.serve(async (req: Request) => {
+  const preflight = handleCorsPreflightRequest(req)
+  if (preflight) return preflight
+
+  if (req.method !== 'POST') {
+    return jsonResponse({ error: 'Method not allowed' }, 405)
+  }
+
+  try {
+    const user = await requireUser(req)
+    const body = (await req.json()) as ManageRequest
+    const serviceClient = createServiceRoleClient()
+
+    // 현재 구독 정보 조회
+    const { data: sub } = await serviceClient
+      .from('subscriptions')
+      .select('tier, status, payment_provider, payple_payer_id, current_period_end')
+      .eq('user_id', user.id)
+      .maybeSingle()
+
+    if (!sub) {
+      return jsonResponse({ error: 'No subscription found' }, 404)
+    }
+
+    // info: 현재 구독 상태 반환
+    if (body.action === 'info') {
+      return jsonResponse({
+        tier: sub.tier,
+        status: sub.status,
+        payment_provider: sub.payment_provider,
+        current_period_end: sub.current_period_end,
+        has_billing_key: !!sub.payple_payer_id,
+      })
+    }
+
+    // cancel: 구독 취소
+    if (body.action === 'cancel') {
+      if (sub.payment_provider !== 'payple' || !sub.payple_payer_id) {
+        return jsonResponse({ error: 'No active Payple subscription to cancel' }, 400)
+      }
+
+      // 1. Payple 빌링키 해지
+      const config = getPaypleConfig()
+      const auth = await paypleAuth(config, { payWork: 'PUSERDEL' })
+      await paypleDeleteBillingKey(config, auth, sub.payple_payer_id)
+
+      // 2. DB 업데이트 — 현재 구독 기간이 끝날 때까지 유지
+      await serviceClient
+        .from('subscriptions')
+        .update({
+          status: 'canceled',
+          cancel_at: sub.current_period_end ?? new Date().toISOString(),
+          payple_payer_id: null,
+          updated_at: new Date().toISOString(),
+        })
+        .eq('user_id', user.id)
+
+      return jsonResponse({
+        success: true,
+        message: 'Subscription will be canceled at the end of the current period',
+        cancel_at: sub.current_period_end,
+      })
+    }
+
+    return jsonResponse({ error: 'Invalid action. Must be cancel or info' }, 400)
+  } catch (err) {
+    if (err && typeof err === 'object' && 'status' in err && 'message' in err) {
+      return authErrorResponse(err as AuthError, corsHeaders)
+    }
+    const message = err instanceof Error ? err.message : 'Unknown error'
+    return jsonResponse({ error: message }, 500)
+  }
+})