feat(appshell): integrate @abe-kap/appshell-sdk (strangler, mock fallback)
Wire the AppShell SDK for auth/identity across the CRM, gated behind
isShellConfigured() so the existing mock portal + static demo user stay
the fallback until the Shell BFF is configured.
- providers.tsx: app-wide <AppShellProvider> (auth passed only when Supabase env set)
- next.config.ts: transpilePackages + /shell -> BFF rewrite (keeps /api/geo intact)
- login: password -> login(), social -> loginWithOAuth(), OAuth return -> completeOAuthLogin()
- register: email/password sign-ups call register() on finish
- dashboard: AuthGate bounces unauthenticated visitors; topbar shows ACE identity
- docs/APPSHELL_INTEGRATION.md, .env.local.example, .npmrc for GitHub Packages
tanweer919
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