[INT-009] Connector Management API

[quaid]

Story

As a tenant admin, I need an API to manage content connectors so that I can configure, test, and monitor my integrations.

Acceptance Criteria

• API endpoint: GET /api/v1/connectors - list configured connectors
• API endpoint: POST /api/v1/connectors - add new connector
• API endpoint: DELETE /api/v1/connectors/{id} - remove connector
• API endpoint: POST /api/v1/connectors/{id}/test - test connection
• API endpoint: GET /api/v1/connectors/{id}/status - check health
• Secure credential handling (never return secrets)
• Connector type registry (strapi, gdocs, future types)
• Unit and integration tests

Technical Notes

• Credentials stored encrypted per tenant
• Test endpoint validates connectivity without exposing secrets
• Support for multiple connectors of same type per tenant

Dependencies

• INT-005 (Strapi Pipeline Integration)
• INT-008 (Google Docs Pipeline Integration)

Points: 2
Type: Feature
Branch: feature/INT-009