feat: Add initial setup page and functionality for admin account creation

- Created setup.html for the initial configuration of the admin account.
- Implemented setup.js to handle form submission and validation.
- Added logo images for branding.
- Introduced storage.js for API data handling (load, save, remove).
- Added styles.css for consistent styling across the application.

setup.js

@@ -0,0 +1,36 @@
+document.getElementById('setupForm').addEventListener('submit', async (e) => {
+    e.preventDefault();
+
+    const name = document.getElementById('fullName').value;
+    const username = document.getElementById('username').value;
+    const password = document.getElementById('password').value;
+    const confirmPassword = document.getElementById('confirmPassword').value;
+    const errorMessage = document.getElementById('error-message');
+
+    if (password !== confirmPassword) {
+        errorMessage.textContent = 'Las contraseñas no coinciden.';
+        return;
+    }
+
+    try {
+        const response = await fetch('/api/setup', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify({ name, username, password })
+        });
+
+        const result = await response.json();
+
+        if (response.ok) {
+            alert('Cuenta de administrador creada exitosamente. Ahora serás redirigido a la página de inicio de sesión.');
+            window.location.href = '/login.html';
+        } else {
+            errorMessage.textContent = result.error || 'Ocurrió un error al crear la cuenta.';
+        }
+    } catch (error) {
+        errorMessage.textContent = 'Error de conexión con el servidor.';
+        console.error('Error en el setup:', error);
+    }
+});