feat(server): Payple 정기 갱신 크론 — payple-renew Edge Function + GitHub Actions

- payple-renew: 만료 구독 조회 → paypleBilling → 기간 갱신
- 3회 연속 실패 시 tier=free, status=expired 다운그레이드
- migration: subscriptions.renewal_failures 컬럼 추가
- payple-webhook: 결제 완료 시 renewal_failures=0 리셋
- GitHub Actions: 매일 01:00 UTC 스케줄

.github/workflows/payple-renew.yml

@@ -0,0 +1,29 @@
+name: Payple Subscription Renewal
+
+on:
+  schedule:
+    # 매일 01:00 UTC (KST 10:00)
+    - cron: '0 1 * * *'
+  workflow_dispatch: {}
+
+jobs:
+  renew:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger payple-renew Edge Function
+        run: |
+          response=$(curl -s -w "\n%{http_code}" -X POST \
+            "${{ secrets.SUPABASE_URL }}/functions/v1/payple-renew" \
+            -H "Authorization: Bearer ${{ secrets.CRON_SECRET }}" \
+            -H "Content-Type: application/json")
+
+          http_code=$(echo "$response" | tail -1)
+          body=$(echo "$response" | head -n -1)
+
+          echo "HTTP $http_code"
+          echo "$body" | jq . 2>/dev/null || echo "$body"
+
+          if [ "$http_code" -ge 400 ]; then
+            echo "::error::Renewal failed with HTTP $http_code"
+            exit 1
+          fi