Add comprehensive e2e tests for API procedures with 100% coverage

- Add admin.test.ts: Tests for superuser operations (users, orgs, sites)
- Add orgs.test.ts: Tests for org management, members, invites, sites
- Expand me.test.ts: Add API tokens, invites, authMiddleware error paths
- Expand auth.test.ts: Add loginRequestMiddleware tests, weak password test fix

Bug fixes:
- Fix countOwners() in orgs/helpers.ts to convert PostgreSQL bigint to number
- Fix signup race condition by handling unique constraint violations gracefully

All 283 tests pass with 100% function coverage on procedures.

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

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

@@ -120,5 +120,6 @@ export async function countOwners(
     .where("role", "=", "owner")
     .executeTakeFirstOrThrow();
 
-  return result.count;
+  // PostgreSQL COUNT returns bigint which may be a string; ensure numeric comparison works
+  return Number(result.count);
 }