feat: organization guardrails and team seat billing (#581-582)

[2witstudios]

Summary

• Organization schema with guardrail settings (allowedAIProviders, maxStorage, maxAITokens, requireMFA, allowExternalSharing, allowedDomains)
• Org membership system with OWNER/ADMIN/MEMBER roles and domain-restricted invites
• Stripe per-seat billing with 4 tiers: Free / Pro ($14/seat) / Business ($28/seat) / Enterprise
• Auto seat adjustment on member add/remove with prorated billing and 3-day grace period
• API routes: org CRUD, settings, members, billing, seats, invoices
• Enforcement middleware with pure guardrail check functions
• 35 passing unit tests across guardrails and billing plans

Test plan

• Guardrail enforcement works (AI provider, storage, domain, external sharing checks)
• Org CRUD and member management API routes respond correctly
• Stripe per-seat subscription creation and seat adjustment
• Invoice listing via Stripe API
• Unit tests pass: cd apps/web && pnpm vitest run src/lib/orgs/__tests__/

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📥 Commits

Reviewing files that changed from the base of the PR and between afb36e6 and 057295a.

📒 Files selected for processing (21)

• apps/web/src/app/api/orgs/[orgId]/billing/invoices/route.ts
• apps/web/src/app/api/orgs/[orgId]/billing/route.ts
• apps/web/src/app/api/orgs/[orgId]/billing/seats/route.ts
• apps/web/src/app/api/orgs/[orgId]/members/[userId]/route.ts
• apps/web/src/app/api/orgs/[orgId]/members/route.ts
• apps/web/src/app/api/orgs/[orgId]/route.ts
• apps/web/src/app/api/orgs/[orgId]/settings/route.ts
• apps/web/src/app/api/orgs/route.ts
• apps/web/src/lib/orgs/__tests__/billing-plans.test.ts
• apps/web/src/lib/orgs/__tests__/guardrails.test.ts
• apps/web/src/lib/orgs/billing-plans.ts
• apps/web/src/lib/orgs/guardrail-checks.ts
• apps/web/src/lib/orgs/guardrails.ts
• apps/web/src/lib/orgs/org-auth.ts
• apps/web/src/lib/orgs/org-webhook-handlers.ts
• apps/web/src/lib/orgs/seat-manager.ts
• packages/db/drizzle/0090_youthful_black_widow.sql
• packages/db/drizzle/meta/0090_snapshot.json
• packages/db/drizzle/meta/_journal.json
• packages/db/src/schema.ts
• packages/db/src/schema/organizations.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/orgs-billing

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