Add TuxiNet branding and document templates

app/Controllers/AuthController.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Controllers;
+
+use App\Core\Controller;
+use App\Core\Response;
+use App\Services\AuthService;
+
+class AuthController extends Controller
+{
+    public function showLogin(): Response
+    {
+        return $this->view('auth/login');
+    }
+
+    public function login(): Response
+    {
+        $email = $_POST['email'] ?? '';
+        $password = $_POST['password'] ?? '';
+
+        $auth = AuthService::getInstance();
+        if ($auth->attempt($email, $password)) {
+            return $this->redirect('/');
+        }
+
+        return $this->view('auth/login', [
+            'error' => 'Invalid credentials or inactive account.',
+        ]);
+    }
+
+    public function logout(): Response
+    {
+        AuthService::getInstance()->logout();
+        return $this->redirect('/login');
+    }
+}