SCIM Provisioning with Scalekit

Adds automated user lifecycle management (create, update, deactivate) via Scalekit's Directory API and real-time webhooks.

Workflow

Copy and track progress:

SCIM Implementation Progress:
- [ ] Step 1: Detect stack and install SDK
- [ ] Step 2: Configure environment credentials
- [ ] Step 3: Initialize Scalekit client
- [ ] Step 4: Add Directory API sync (polling/on-demand)
- [ ] Step 5: Add webhook endpoint (real-time)
- [ ] Step 6: Register webhook in Scalekit dashboard
- [ ] Step 7: Map directory events to local user operations
- [ ] Step 8: Validate end-to-end