refactor(billing): remove Stripe; payments are Payple (web) and Google Play (mobile)

Stripe is not used. Keeping its checkout, portal and webhook paths meant a
second payment provider, a second return-URL format and dead UI.

- Delete the stripe-checkout, stripe-portal and stripe-webhook functions and
  their config; billing-catalog serves Payple prices only, and the web parser
  rejects a catalog that still mixes in Stripe prices.
- Web: drop the Stripe checkout/portal buttons, provider toggle and return
  notices; billing shows Payple only. Past rows with provider='stripe' are
  still displayed ("Stripe (종료)") with a support contact instead of a portal.
- Desktop: delete the Stripe checkout modal, payment IPC channels, preload
  namespace and their types; "Remove ads with Pro" opens the web billing page
  via license.openBilling. Support/refund copy names Payple.
- billingUrl() loses the Stripe-only success/canceled result option; the
  Deno contract is regenerated.
- Migrations and the DB's accepted provider values are untouched (history).
- Docs and the backlog record the removal (MON-04, EXT-STRIPE-01, GAP-BILL-03).

Verified: typecheck (desktop/web/admin/api-client/mobile), contract:check,
deno check all functions, deno test 80/80, desktop 1478/1480 on the Electron
runtime (2 known environment failures), web and admin builds, release
metadata and mobile boundary self-tests, eslint on changed files.

docs/map/02-infrastructure.md

@@ -165,8 +165,8 @@ Public endpoints (production): `https://d3ro.chanpaca.net` — **랜딩/다운
 ## 7. `server/supabase` (backend)
 
 - `config.toml` — project `d3ro-voice`, ports 55321-55324, DB major 17, auth redirects (localhost, `d3ro.chanpaca.net`, `d3ro-voice://auth-callback`), providers Google/GitHub/Apple.
-- `migrations/` — **63 SQL migrations** (schema, RLS, auth triggers, storage, team invites, knowledge/pgvector, push outbox, Payple/Stripe billing, admin roles, mobile platform/monetization, atomic command reorder, device revocation, content reporting, audit log, meeting documents, STT quota reservations, ad reward replay protection, team activity feed).
-- `functions/` — **~27 Deno Edge Functions** (`stt-proxy`, `llm-proxy`, `content-report`, `generate-meeting-document`, `embed-chunks`, `search-knowledge`, `realtime-token`, `team-invite`, `team-accept`, `send-push`, `account-delete`, `admin-users`, `admin-subscriptions`, `admin-payments`, `admin-audit-log`, billing `billing-catalog`/`stripe-checkout`/`stripe-portal`/`stripe-webhook`/`payple-checkout`/`payple-manage`/`payple-renew`/`payple-webhook`, `iap-verify`, `admob-ssv`, `google-play-rtdn`). Shared contracts in `functions/_shared/` — push transports now include `webpush.ts` (VAPID + RFC 8291) and `apns.ts` (.p8 token) alongside FCM. CI (`edge-functions-quality`) runs `deno check` + `deno test` and also the Cloudflare worker drain test.
+- `migrations/` — **63 SQL migrations** (schema, RLS, auth triggers, storage, team invites, knowledge/pgvector, push outbox, Payple billing (legacy Stripe columns/provider values kept for history), admin roles, mobile platform/monetization, atomic command reorder, device revocation, content reporting, audit log, meeting documents, STT quota reservations, ad reward replay protection, team activity feed).
+- `functions/` — **~24 Deno Edge Functions** (`stt-proxy`, `llm-proxy`, `content-report`, `generate-meeting-document`, `embed-chunks`, `search-knowledge`, `realtime-token`, `team-invite`, `team-accept`, `send-push`, `account-delete`, `admin-users`, `admin-subscriptions`, `admin-payments`, `admin-audit-log`, billing `billing-catalog`/`payple-checkout`/`payple-manage`/`payple-renew`/`payple-webhook`, `iap-verify`, `admob-ssv`, `google-play-rtdn`; Stripe functions removed 2026-09-26). Shared contracts in `functions/_shared/` — push transports now include `webpush.ts` (VAPID + RFC 8291) and `apns.ts` (.p8 token) alongside FCM. CI (`edge-functions-quality`) runs `deno check` + `deno test` and also the Cloudflare worker drain test.
 - `tests/` — integration/E2E for content report, mobile platform/recording/reward-race, payments, mobile release preflight, push, team push security, STT quota.
 
 Full detail: [`09-supabase-backend.md`](./09-supabase-backend.md).