Get collections

Retrieve a paginated list of all collections visible to the API key.

Personal API keys receive the key owner's virtual Private collection with ID `private`. Workspace API keys never receive private collections.

This endpoint allows you to:
- List all collections available to the current workspace
- Paginate through large sets of collections
- Use for collection pickers, dashboards, or management UIs

**Use cases:**
- Displaying available collections to users
- Building collection management interfaces
- Syncing collections with external tools