feat(V2-6/V2-7/V2-8): Mobile MVP + Teams + Billing 스캐폴딩

V2-6 — Mobile (Expo) MVP
- apps/mobile/ 신규, npm workspace에서 제외 (Expo deps 부담 회피)
- Expo SDK 51 + Expo Router + AsyncStorage Supabase 클라이언트
- 화면: index/login/(tabs)/{meetings,record,profile}
- expo-av로 녹음 → Edge Function stt-proxy 호출
- expo-web-browser + expo-linking으로 OAuth 콜백 처리
- README에 setup/EAS build 가이드
- 루트 package.json workspaces를 명시 나열로 변경 (apps/mobile 제외)

V2-7 — 팀 기능 (Web)
- apps/web/src/app/teams/page.tsx — 가입한 팀 카드 그리드
- apps/web/src/app/teams/[id]/page.tsx — 멤버 + 공유 회의
- components/teams/create-team-form.tsx — 팀 생성 + owner 자동 team_members
- components/teams/invite-member-form.tsx — user_id 직접 초대 (V2-7b에서 invite flow)
- Sidebar에 Teams/Billing 메뉴 + 아이콘
- ko.json에 nav.teams/nav.billing 키 추가
- V2-2 teams/team_members RLS 활용

V2-8 — 결제 스캐폴딩
- apps/web/src/app/billing/page.tsx — Free/Pro/Team 가격표 + 현재 구독
- components/billing/checkout-button.tsx — Edge Function 호출 후 redirect
- server/supabase/functions/stripe-checkout/index.ts:
  - JWT 인증 -> 기존 customer 조회/생성 -> Checkout Session 생성
  - subscriptions 테이블에 customer_id upsert
- server/supabase/functions/stripe-webhook/index.ts:
  - checkout.session.completed -> subscriptions tier=pro/team active
  - customer.subscription.updated/created -> status/period 업데이트
  - customer.subscription.deleted -> tier=free, status=canceled
  - signature 검증은 placeholder (V2-8b에서 정식)
- server/supabase/config.toml에 두 함수 등록 (webhook verify_jwt=false)

검증:
- desktop typecheck OK (회귀 없음)
- web typecheck OK
- web next build OK (11 라우트)
- mobile은 별도 install 필요 (workspace 제외)

memory/project_status.md 갱신 — V2 마스터 플랜 전 페이즈 로컬 완료

apps/web/src/components/billing/checkout-button.tsx

@@ -0,0 +1,85 @@
+'use client'
+
+// apps/web/src/components/billing/checkout-button.tsx
+// Stripe Checkout 시작 — Edge Function stripe-checkout 호출
+
+import { useState } from 'react'
+import { Button, CircularProgress, Alert, Box } from '@mui/material'
+import { getSupabaseBrowserClient } from '@/lib/supabase-browser'
+
+interface CheckoutButtonProps {
+  tier: 'pro' | 'team'
+}
+
+export function CheckoutButton({ tier }: CheckoutButtonProps): React.ReactElement {
+  const [busy, setBusy] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  async function handleCheckout(): Promise<void> {
+    setError(null)
+    setBusy(true)
+    try {
+      const supabase = getSupabaseBrowserClient()
+      const {
+        data: { session }
+      } = await supabase.auth.getSession()
+
+      if (!session) {
+        setError('로그인이 필요합니다')
+        return
+      }
+
+      const response = await fetch(
+        `${process.env.NEXT_PUBLIC_SUPABASE_URL}/functions/v1/stripe-checkout`,
+        {
+          method: 'POST',
+          headers: {
+            Authorization: `Bearer ${session.access_token}`,
+            'Content-Type': 'application/json'
+          },
+          body: JSON.stringify({
+            tier,
+            success_url: `${window.location.origin}/billing?success=1`,
+            cancel_url: `${window.location.origin}/billing?canceled=1`
+          })
+        }
+      )
+
+      if (!response.ok) {
+        const txt = await response.text()
+        throw new Error(`Checkout 시작 실패: ${response.status} ${txt}`)
+      }
+
+      const data = (await response.json()) as { url?: string }
+      if (data.url) {
+        window.location.href = data.url
+      } else {
+        setError('Checkout URL을 받지 못했습니다')
+      }
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Unknown error')
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  return (
+    <Box>
+      <Button
+        fullWidth
+        variant="contained"
+        size="large"
+        onClick={() => void handleCheckout()}
+        disabled={busy}
+        startIcon={busy ? <CircularProgress size={16} color="inherit" /> : null}
+      >
+        업그레이드
+      </Button>
+      {error && (
+        <Alert severity="error" variant="outlined" sx={{ mt: 1, fontSize: 11 }}>
+          {error}
+        </Alert>
+      )}
+    </Box>
+  )
+}