feat: 初始版本，圆角主题与首次管理员引导

app/templates/admin/activities.html

@@ -0,0 +1,31 @@
+{% extends 'base.html' %}
+{% block title %}活动管理{% endblock %}
+{% block content %}
+<h3>活动管理</h3>
+<form method="post" class="mb-3">
+  <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+  <div class="mb-2"><input class="form-control" name="title" placeholder="标题" required></div>
+  <div class="mb-2"><input class="form-control" name="theme" placeholder="主题"></div>
+  <div class="mb-2"><textarea class="form-control" name="description" placeholder="描述"></textarea></div>
+  <button class="btn btn-primary" type="submit">创建</button>
+  </form>
+<table class="table">
+  <tr><th>标题</th><th>状态</th><th>操作</th></tr>
+  {% for a in activities %}
+  <tr>
+    <td>{{ a.title }}</td>
+    <td>{{ a.status.value }}</td>
+    <td>
+      <form method="post" action="{{ url_for('admin.publish_activity', act_id=a.id) }}" style="display:inline">
+        <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+        <button class="btn btn-success">发布</button>
+      </form>
+      <form method="post" action="{{ url_for('admin.close_activity', act_id=a.id) }}" style="display:inline">
+        <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+        <button class="btn btn-warning">关闭</button>
+      </form>
+    </td>
+  </tr>
+  {% endfor %}
+</table>
+{% endblock %}