## Summary
This PR makes the Clickhouse audit logging in the impersonation flow
**non-blocking** (fire-and-forget).
## Problem
When the Clickhouse server is unavailable or slow, the impersonation
feature becomes blocked because all audit logging calls use `await`,
causing the entire impersonation flow to hang.
## Solution
Remove the `await` keyword from all audit logging calls in the
impersonation flow. The `ClickHouseService.insert()` method already
handles errors internally (catches and logs them), so there's no risk of
unhandled promise rejections.
## Changes
- **`impersonation.service.ts`**: 4 audit calls made non-blocking
- **`auth.resolver.ts`**: 5 audit calls made non-blocking
- **`auth.service.ts`**: 2 audit calls made non-blocking
## Testing
- Impersonation flow continues to work when Clickhouse is available
- Impersonation flow no longer blocks when Clickhouse is unavailable
Félix Malfait
1f9a6b067a