feat: configure signed Memos webhooks when supported

lib/memos.ts

@@ -6,6 +6,10 @@ async function request(url: string, token: string, init?: RequestInit) {
   const res = await fetch(url, { ...init, headers: { Authorization: `Bearer ${token}`, "Content-Type": "application/json", ...(init?.headers || {}) }, cache: "no-store" });
   if (!res.ok) throw new Error(`Memos API ${res.status}: ${await res.text()}`); return res;
 }
+export async function createUserWebhook(baseUrl: string, token: string, userName: string, webhook: { url: string; displayName: string; signingSecret: string }) {
+  const user = userName.split("/").at(-1); if (!user) throw new Error("Invalid Memos user");
+  return (await request(`${base(baseUrl)}/users/${encodeURIComponent(user)}/webhooks`, token, { method: "POST", body: JSON.stringify(webhook) })).json() as Promise<{ name: string }>;
+}
 export async function verifyMemos(baseUrl: string, token: string) { await request(`${base(baseUrl)}/memos?pageSize=1`, token); }
 export async function getMemosIdentity(baseUrl: string, token: string) {
   const user = await (await request(`${base(baseUrl)}/auth/status`, token, { method: "POST", body: "{}" })).json() as MemosIdentity;