- Add new endpoints for managing team integrations:
- GET /id/<team_id>/integrations
- POST /id/<team_id>/integrations/<integration_type>
- DELETE /id/<team_id>/integrations/<integration_id>
- PATCH /id/<team_id>/integrations/<integration_id>
- Introduce schemas for TeamIntegration and TeamDiscordIntegration
- Update models to include nullable webhook_url