fix: make impersonation audit logging non-blocking (#16390)

## 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

packages/twenty-server/src/engine/core-modules/auth/auth.resolver.ts

@@ -706,7 +706,7 @@ export class AuthResolver {
       userId: impersonatorUserWorkspace.user.id,
     });
 
-    await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+    auditService.insertWorkspaceEvent(MONITORING_EVENT, {
       eventName: `${isServerLevelImpersonation ? 'server' : 'workspace'}.impersonation.token_exchange_attempt`,
       message: `Impersonation token exchange attempt for ${targetUserEmail} by ${impersonatorUserWorkspace.user.id}`,
     });
@@ -717,7 +717,7 @@ export class AuthResolver {
 
     if (isServerLevelImpersonation) {
       if (!hasServerLevelImpersonatePermission) {
-        await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+        auditService.insertWorkspaceEvent(MONITORING_EVENT, {
           eventName: 'server.impersonation.token_exchange_failed',
           message: `Server level impersonation not allowed for ${targetUserEmail} by userId ${impersonatorUserWorkspace.user.id}`,
         });
@@ -728,7 +728,7 @@ export class AuthResolver {
         );
       }
 
-      await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+      auditService.insertWorkspaceEvent(MONITORING_EVENT, {
         eventName: `server.impersonation.token_exchange_success`,
         message: `Impersonation token exchanged for ${targetUserEmail} by userId ${impersonatorUserWorkspace.user.id}`,
       });
@@ -750,7 +750,7 @@ export class AuthResolver {
       });
 
     if (!hasWorkspaceLevelImpersonatePermission) {
-      await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+      auditService.insertWorkspaceEvent(MONITORING_EVENT, {
         eventName: 'workspace.impersonation.token_exchange_failed',
         message: `Impersonation not allowed for ${targetUserEmail} by userId ${impersonatorUserWorkspace.user.id}`,
       });
@@ -760,7 +760,7 @@ export class AuthResolver {
       );
     }
 
-    await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+    auditService.insertWorkspaceEvent(MONITORING_EVENT, {
       eventName: 'workspace.impersonation.token_exchange_success',
       message: `Impersonation token exchanged for ${targetUserEmail} by userId ${impersonatorUserWorkspace.user.id}`,
     });

packages/twenty-server/src/engine/core-modules/auth/services/auth.service.ts

@@ -410,7 +410,7 @@ export class AuthService {
       userId: impersonatorUserId,
     });
 
-    await analytics.insertWorkspaceEvent('Monitoring', {
+    analytics.insertWorkspaceEvent('Monitoring', {
       eventName: 'workspace.impersonation.attempted',
       message: `correlationId=${correlationId}; impersonatorUserWorkspaceId=${impersonatorUserWorkspaceId}; targetUserWorkspaceId=${impersonatedUserWorkspaceId}; workspaceId=${workspaceId}`,
     });
@@ -436,7 +436,7 @@ export class AuthService {
       true,
     );
 
-    await analytics.insertWorkspaceEvent('Monitoring', {
+    analytics.insertWorkspaceEvent('Monitoring', {
       eventName: 'workspace.impersonation.issued',
       message: `correlationId=${correlationId}; impersonatorUserWorkspaceId=${impersonatorUserWorkspaceId}; targetUserWorkspaceId=${impersonatedUserWorkspaceId}; workspaceId=${workspaceId}`,
     });

packages/twenty-server/src/engine/core-modules/impersonation/services/impersonation.service.ts

@@ -144,13 +144,13 @@ export class ImpersonationService {
       userId: impersonatorUserWorkspace.user.id,
     });
 
-    await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+    auditService.insertWorkspaceEvent(MONITORING_EVENT, {
       eventName: `${impersonationLevel}.impersonation.attempt`,
       message: `Impersonation attempt: targetUserId=${toImpersonateUserWorkspace.user.id}, workspaceId=${toImpersonateUserWorkspace.workspace.id}, impersonatorUserId=${impersonatorUserWorkspace.user.id}`,
     });
 
     try {
-      await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+      auditService.insertWorkspaceEvent(MONITORING_EVENT, {
         eventName: `${impersonationLevel}.impersonation.login_token_attempt`,
         message: `Impersonation token generation attempt for user ${toImpersonateUserWorkspace.user.id}`,
       });
@@ -164,7 +164,7 @@ export class ImpersonationService {
         },
       );
 
-      await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+      auditService.insertWorkspaceEvent(MONITORING_EVENT, {
         eventName: `${impersonationLevel}.impersonation.login_token_generated`,
         message: `Impersonation token generated successfully for user ${toImpersonateUserWorkspace.user.id}`,
       });
@@ -179,7 +179,7 @@ export class ImpersonationService {
         loginToken,
       };
     } catch {
-      await auditService.insertWorkspaceEvent(MONITORING_EVENT, {
+      auditService.insertWorkspaceEvent(MONITORING_EVENT, {
         eventName: `${impersonationLevel}.impersonation.login_token_failed`,
         message: `Impersonation token generation failed for targetUserId=${toImpersonateUserWorkspace.user.id}`,
       });