Add admin panel, cart, checkout, and digital key delivery

Co-authored-by: Cursor <cursoragent@cursor.com>

app/templates/admin/order_detail.html

@@ -0,0 +1,25 @@
+{% extends "admin/base.html" %}
+{% block title %}Заказ {{ order.public_id }} — {{ app_name }}{% endblock %}
+
+{% block content %}
+<div class="section-head">
+  <h2>Заказ {{ order.public_id }}</h2>
+  <p>{{ order.email }} · {{ order.status }} · {{ order.total | rub }}</p>
+</div>
+
+{% if order.customer_note %}
+<p><strong>Комментарий:</strong> {{ order.customer_note }}</p>
+{% endif %}
+
+{% for item in order.items %}
+<article class="order-item">
+  <h3>{{ item.title }} × {{ item.quantity }}</h3>
+  <p class="muted">{{ item.unit_price | rub }}</p>
+  {% if item.delivered_codes %}
+  <pre class="codes">{{ item.delivered_codes }}</pre>
+  {% endif %}
+</article>
+{% endfor %}
+
+<a class="btn btn-ghost" href="/admin/orders">← К списку</a>
+{% endblock %}