fix(logger): batch fix audit-logger, circular meta, and sync callers

- Make logAudit and closeAuditLogger synchronous (were async for no reason)
- Set audit-logger silent:true initially, enable on applyAuditConfig()
- Add try-catch for circular references in consoleFormat meta JSON
- Update all callers to remove unnecessary await/.catch() on sync functions
- Add comment to shared.ts explaining acceptable sync FS usage
- Fix audit-logger test for sync closeAuditLogger

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/ipc/settings-handler.ts

@@ -74,7 +74,7 @@ export function registerSettingsHandlers(): void {
             resource: 'ERP_CONFIG',
             status: 'success',
             metadata: { changeType: 'erp_credentials', usernameChanged: !!settings.erp.username }
-          }).catch((err) => log.warn('Failed to write audit log', { err }))
+          })
         }
 
         return { success: true }