feat: 初始版本，圆角主题与首次管理员引导

app/templates/auth/register.html

@@ -0,0 +1,13 @@
+{% extends 'base.html' %}
+{% block title %}注册{% endblock %}
+{% block content %}
+<h3 class="mb-3">注册</h3>
+<form class="card p-3" method="post" enctype="multipart/form-data">
+  <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+  <div class="mb-3"><label class="form-label">邮箱</label><input class="form-control" name="email" type="email" required></div>
+  <div class="mb-3"><label class="form-label">用户名</label><input class="form-control" name="username" required></div>
+  <div class="mb-3"><label class="form-label">密码</label><input class="form-control" name="password" type="password" required></div>
+  <div class="mb-3"><label class="form-label">学生身份照片</label><input class="form-control" name="identity_photo" type="file" accept="image/*" required></div>
+  <button class="btn btn-brand" type="submit">提交</button>
+</form>
+{% endblock %}