初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

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

embed_static/templates/register.html

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+{{define "register.html"}}{{template "layout" .}}{{end}}
+{{define "content"}}
+<div class="row justify-content-center">
+  <div class="col-md-5">
+    <div class="card shadow-sm">
+      <div class="card-body p-4">
+        <h3 class="text-center mb-4">注册账号</h3>
+        <p class="text-center text-muted small mb-3">本站首个注册用户将自动成为管理员</p>
+        <form id="regForm">
+          <div class="mb-3">
+            <label class="form-label">用户名（3-32位字母数字下划线）</label>
+            <input type="text" name="username" class="form-control" required>
+          </div>
+          <div class="mb-3">
+            <label class="form-label">昵称</label>
+            <input type="text" name="nickname" class="form-control">
+          </div>
+          <div class="mb-3">
+            <label class="form-label">密码（至少6位）</label>
+            <input type="password" name="password" class="form-control" required>
+          </div>
+          <button type="submit" class="btn btn-success w-100">注册</button>
+        </form>
+        <p class="text-center mt-3 mb-0">已有账号？<a href="/login">去登录</a></p>
+      </div>
+    </div>
+  </div>
+</div>
+{{end}}
+{{define "scripts"}}
+<script>
+document.getElementById('regForm').addEventListener('submit', function(e){
+  e.preventDefault();
+  apiPost('/api/register', this, true).then(d=>{
+    if(d.error){ showToast(d.error,'danger'); return; }
+    showToast('注册成功'); location.href='/';
+  });
+});
+</script>
+{{end}}