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/static/js/app.js

@@ -0,0 +1,28 @@
+// 姜十三论坛前端通用脚本
+function apiPost(url, data, isForm) {
+  const opts = { method: 'POST', credentials: 'same-origin' };
+  if (isForm) {
+    opts.body = new FormData(data instanceof HTMLFormElement ? data : undefined);
+    if (!(data instanceof HTMLFormElement)) {
+      const fd = new FormData();
+      for (const k in data) fd.append(k, data[k]);
+      opts.body = fd;
+    }
+  } else {
+    opts.headers = { 'Content-Type': 'application/json' };
+    opts.body = JSON.stringify(data);
+  }
+  return fetch(url, opts).then(r => r.json());
+}
+
+function showToast(msg, type) {
+  const el = document.getElementById('toast');
+  if (!el) { alert(msg); return; }
+  el.className = 'toast align-items-center text-bg-' + (type || 'success') + ' border-0 show';
+  el.querySelector('.toast-body').textContent = msg;
+  new bootstrap.Toast(el).show();
+}
+
+function confirmAction(msg, callback) {
+  if (confirm(msg)) callback();
+}