Previously, deleting a user via SCIM (`DELETE /scim/v2/Users/{id}`) or
marking them inactive (`PATCH active=false` / `PUT active=false`) only
touched the user row. Their virtual keys kept working because:
- `litellm_verificationtoken` was never updated.
- The auth path's combined-view query on the key never joined to the
user's active state.
- `get_user_object()` was wrapped in a silent `except` that set
`user_obj=None` when the owning user record was gone, so requests
proceeded normally.
Changes:
- Add `_set_user_keys_blocked(user_id, blocked)` in scim_v2.py that
flips only mismatched rows via `update_many` and invalidates each
affected token in the dual cache.
- Cascade SCIM lifecycle events to keys:
- `delete_user`: block all of the user's keys before deleting the
user row (preserves spend/audit while orphaning safely).
- `patch_user` / `update_user`: on `scim_active` transitions,
block (false) or unblock (true) the user's keys.
- Defense in depth in `user_api_key_auth`: reject the request when the
loaded `user_obj` has `metadata.scim_active == False`, even if a
cached key snuck past the per-key block.
- `transform_litellm_user_to_scim_user` now reflects the real
`scim_active` value instead of always returning `active=True`.
Tests:
- New `test_scim_key_deactivation.py` covering DELETE, PATCH
active=false, PATCH active=true, no-op patches, and the helper's
cache-invalidation contract.
- New `test_scim_deactivated_user_key_is_rejected` exercising the
auth-path defense.
- Existing PATCH tests updated with verificationtoken mocks for the
new code path.
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