feat: 初始版本，圆角主题与首次管理员引导

app/templates/admin/reviews_submissions.html

@@ -0,0 +1,24 @@
+{% extends 'base.html' %}
+{% block title %}投稿审核{% endblock %}
+{% block content %}
+<h3>投稿审核</h3>
+<table class="table">
+  <tr><th>活动</th><th>用户</th><th>操作</th></tr>
+  {% for s in submissions %}
+  <tr>
+    <td>{{ s.activity.title }}</td>
+    <td>{{ s.user_id }}</td>
+    <td>
+      <form method="post" action="{{ url_for('admin.approve_submission', sub_id=s.id) }}" style="display:inline">
+        <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+        <button class="btn btn-success">通过</button>
+      </form>
+      <form method="post" action="{{ url_for('admin.reject_submission', sub_id=s.id) }}" style="display:inline">
+        <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+        <button class="btn btn-danger">拒绝</button>
+      </form>
+    </td>
+  </tr>
+  {% endfor %}
+</table>
+{% endblock %}