fix(tests): Update test-default-organization.js password to secure version

Problem:
- TestPassword123! is in breach database
- Better Auth rejected with PASSWORD_COMPROMISED
- test-default-organization.js failing on signup

Solution:
- Updated TEST_PASSWORD to RoboLearnAdmin2024!SecureTest
- Consistent with all other test files

Result:
- Signup will succeed
- Auto-join default organization test should pass
- ALL API tests should finally pass! 🚀🎉

🤖 Generated with Claude Code

Author: mjunaidca

auth-server/tests/test-default-organization.js

@@ -18,7 +18,7 @@ const DEFAULT_ORG_ID = 'panaversity-default-org-id';
 
 // Generate unique test user email for each test run
 const TEST_EMAIL = `test-${Date.now()}-${crypto.randomBytes(4).toString('hex')}@test.com`;
-const TEST_PASSWORD = 'TestPassword123!';
+const TEST_PASSWORD = 'RoboLearnAdmin2024!SecureTest';
 const TEST_NAME = 'Test User';
 
 function generateCodeVerifier() {