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

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

app/templates/admin/keys.html

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+{% extends "admin/base.html" %}
+{% block title %}Ключи — {{ product.title }}{% endblock %}
+
+{% block content %}
+<div class="section-head">
+  <h2>Ключи: {{ product.title }}</h2>
+  <p>Свободно: {{ stock }} шт.</p>
+</div>
+
+{% if message %}
+<p class="flash ok">{{ message }}</p>
+{% endif %}
+
+<form method="post" class="stack-form">
+  <label>
+    Добавить ключи (по одному на строку)
+    <textarea name="codes" rows="8" required placeholder="XXXX-YYYY-ZZZZ"></textarea>
+  </label>
+  <button class="btn btn-primary" type="submit">Загрузить</button>
+</form>
+
+<div class="table-wrap" style="margin-top: 2rem">
+  <table class="data-table">
+    <thead>
+      <tr>
+        <th>Код</th>
+        <th>Статус</th>
+        <th>Order</th>
+      </tr>
+    </thead>
+    <tbody>
+      {% for key in keys %}
+      <tr>
+        <td><code>{{ key.code }}</code></td>
+        <td>{% if key.is_sold %}sold{% else %}free{% endif %}</td>
+        <td>{% if key.order_id %}#{{ key.order_id }}{% else %}—{% endif %}</td>
+      </tr>
+      {% else %}
+      <tr><td colspan="3">Ключей пока нет</td></tr>
+      {% endfor %}
+    </tbody>
+  </table>
+</div>
+{% endblock %}