Fix TypeScript and lint errors

- Add missing reqHeaders/resHeaders to webauthn test context
- Fix Session.id type from number to string in test
- Remove unnecessary Number() conversion in countOwners

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api-server/src/procedures/orgs/helpers.ts

@@ -120,5 +120,5 @@ export async function countOwners(
     .where("role", "=", "owner")
     .executeTakeFirstOrThrow();
 
-  return Number(result.count);
+  return result.count;
 }