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>

frontend/src/utils/guest.ts

@@ -0,0 +1,43 @@
+const GUEST_NICK_KEY = 'j13_guest_nick';
+const GUEST_EMAIL_KEY = 'j13_guest_email';
+const GUEST_URL_KEY = 'j13_guest_url';
+const MY_COMMENT_IDS_KEY = 'j13_my_comment_ids';
+
+export interface GuestInfo {
+  nick: string;
+  email: string;
+  url: string;
+}
+
+export function loadGuestInfo(): GuestInfo {
+  return {
+    nick: localStorage.getItem(GUEST_NICK_KEY) || '',
+    email: localStorage.getItem(GUEST_EMAIL_KEY) || '',
+    url: localStorage.getItem(GUEST_URL_KEY) || '',
+  };
+}
+
+export function saveGuestInfo(info: GuestInfo) {
+  localStorage.setItem(GUEST_NICK_KEY, info.nick);
+  localStorage.setItem(GUEST_EMAIL_KEY, info.email);
+  localStorage.setItem(GUEST_URL_KEY, info.url);
+}
+
+export function loadMyCommentIds(): number[] {
+  try {
+    const raw = localStorage.getItem(MY_COMMENT_IDS_KEY);
+    if (!raw) return [];
+    const arr = JSON.parse(raw);
+    return Array.isArray(arr) ? arr.filter((n) => typeof n === 'number') : [];
+  } catch {
+    return [];
+  }
+}
+
+export function addMyCommentId(id: number) {
+  const ids = loadMyCommentIds();
+  if (!ids.includes(id)) {
+    ids.push(id);
+    localStorage.setItem(MY_COMMENT_IDS_KEY, JSON.stringify(ids.slice(-200)));
+  }
+}