- Database migration: model_pricing, tenant_pricing, pricing_groups,
  redemptions, quota_transactions tables
- User quota fields (quota, used_quota, pricing_group)
- Tenant quota fields for reseller balance tracking
- Seed data: 22 model pricing ratios, 3 pricing groups
- Billing design document (docs/billing-design.md)
- Core handler: tenant events via Kafka on create/update/delete
- Config Syncer: auto-create multi-path ingress per tenant
- Auth: /api/auth/branding endpoint for tenant brand info
- Frontend: dynamic brand loading on landing + login pages
- Fix: viper env binding for nested config keys

- Fix ISSUE-002: POST /api/tokens now returns all fields with correct types
- Fix ISSUE-003: Add token refresh interceptor in api-client before logout
- Fix ISSUE-004: Implement GET /api/members with real DB queries
- Fix ISSUE-005: Re-implement pricing endpoints in billing service
- Add billing service: pricing, quota, usage, redemption modules
- Add auth enhancements: SSO, email templates, mailer, OAuth improvements
- Add frontend modules: account, auth, billing, pricing, quota, settings, usage
- Add i18n messages for new modules (en/zh)
- Update gitignore to exclude root-level build binaries

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>