refactor(core): keep plan prices, cloud quotas and public URLs in one contract (WS-A)

Prices, quotas and site URLs were copied by hand into the edge functions,
admin, desktop and the landing site, and the copies disagreed (Payple billed
9,900/29,900 KRW, admin labels said 12,900/24,900 KRW and $9.9/$19.9, the
site said 2,900/8,900 KRW).

- packages/core/src/plan-catalog.ts is the single source for PLAN_PRICE_KRW
  (Free 0 / Pro 2,900 / Pro+ 8,900 a month) and PLAN_QUOTA.
- packages/core/src/web-urls.ts is the single source for the public origin,
  the /app web-app base path, SITE_URLS and billingUrl().
- Deno cannot bundle packages/core, so scripts/ci/sync-core-contract.mjs
  generates _shared/core-contract.generated.ts; `npm run contract:check`
  fails on drift (same pattern as version:sync).
- Payple checkout, renewal and webhook amount checks now bill the catalog
  price, so existing subscribers move to the new price at their next renewal.
  quota.ts, team-contract.ts and the tests read the generated values.
- Admin MRR/ARR is computed in KRW from the catalog; license labels, the
  release link and desktop PREMIUM_LLM limits derive from core; the site
  imports prices and quotas directly.

Policy: docs/REFACTOR_POLICY.md Wave 3, W3-1 and W3-2.

server/supabase/functions/_shared/team-contract.ts

@@ -1,3 +1,5 @@
+import { PUBLIC_SITE_ORIGIN } from './core-contract.generated.ts'
+
 export type TeamInviteRole = 'admin' | 'member'
 
 export interface TeamInviteInput {
@@ -23,7 +25,8 @@ export class TeamContractError extends Error {
 const UUID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-8][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
 const EMAIL_PATTERN = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
 const INVITE_TOKEN_PATTERN = /^[A-Za-z0-9_-]{20,128}$/
-export const CANONICAL_SITE_ORIGIN = 'https://d3ro.chanpaca.net'
+/** 초대 링크가 허용하는 유일한 사이트 origin. 정본은 packages/core/src/web-urls.ts. */
+export const CANONICAL_SITE_ORIGIN = PUBLIC_SITE_ORIGIN
 
 function requireRecord(value: unknown, code: string): Record<string, unknown> {
   if (value === null || typeof value !== 'object' || Array.isArray(value)) {