first commit

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

app/templates/admin/login.html

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+{% extends "base.html" %}
+{% block title %}Вход — {{ app_name }}{% endblock %}
+{% block body %}
+<div class="login-wrap">
+  <div class="login-card">
+    <div class="brand">
+      <span class="brand-mark">V</span>
+      <span>{{ app_name }}</span>
+    </div>
+    <h1>Вход в админку</h1>
+    <p>Логин и пароль задаются в переменных окружения.</p>
+    {% if error %}<div class="error">{{ error }}</div>{% endif %}
+    <form method="post" action="/admin/login" class="stack">
+      <label>Логин
+        <input name="username" autocomplete="username" required />
+      </label>
+      <label>Пароль
+        <input type="password" name="password" autocomplete="current-password" required />
+      </label>
+      <button class="btn btn-primary" type="submit">Войти</button>
+    </form>
+  </div>
+</div>
+{% endblock %}