"feat: Update login template with new design"

backend/app/templates/login.html

@@ -2,6 +2,11 @@
 
 {% block title %}Anmelden - Mercedes-Benz MYP Platform{% endblock %}
 
+{% block head %}
+{{ super() }}
+<meta name="csrf-token" content="{{ csrf_token() }}">
+{% endblock %}
+
 {% block extra_css %}
 <style>
     /* Mercedes-Benz Corporate Design */
@@ -246,7 +251,7 @@
 {% endblock %}
 
 {% block content %}
-<div class="mercedes-login-container flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
+<div class="flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
     <div class="max-w-md w-full space-y-8">
         <!-- Header -->
         <div class="text-center">
@@ -281,7 +286,12 @@
         <!-- Login Form -->
         <div class="mercedes-card p-8">
             <form id="loginForm" method="POST" action="{{ url_for('login') if url_for else '#' }}" class="space-y-6">
-                {{ form.hidden_tag() if form }}
+                <!-- CSRF Token -->
+                {% if form %}
+                    {{ form.hidden_tag() }}
+                {% else %}
+                    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/>
+                {% endif %}
                 
                 <!-- E-Mail Address -->
                 <div>