Initial commit: Complete NodeJS-native setup

- Migrated from Python pre-commit to NodeJS-native solution
- Reorganized documentation structure
- Set up Husky + lint-staged for efficient pre-commit hooks
- Fixed Dockerfile healthcheck issue
- Added comprehensive documentation index

tests/manual/debug-email-validation.js

@@ -0,0 +1,22 @@
+// Test the email validation in browser console
+console.log('Testing email validation for admin@localhost');
+
+const emailRegex = /^[^\s@]+@[^\s@]+(\.[^\s@]+|localhost)$/;
+const testEmail = 'admin@localhost';
+
+console.log('Email:', testEmail);
+console.log('Regex:', emailRegex.toString());
+console.log('Test result:', emailRegex.test(testEmail));
+
+// Let's also test step by step
+console.log('Parts breakdown:');
+console.log('- Has @ symbol:', testEmail.includes('@'));
+console.log('- Before @:', testEmail.split('@')[0]);
+console.log('- After @:', testEmail.split('@')[1]);
+console.log('- No spaces:', !/\s/.test(testEmail));
+
+// Let's test a simpler regex that should definitely work
+const simpleRegex = /^[^@\s]+@[^@\s]+$/;
+console.log('Simple regex test:', simpleRegex.test(testEmail));
+
+// Copy this code and paste it in the browser console when you get the validation error