增加获取用户 ID 的功能，Agent chat 请求头新增传递 userId

src/lib/authToken.ts

@@ -49,3 +49,30 @@ export const getAccessToken = async () => {
   }
   return null;
 };
+
+export const getUserId = async () => {
+  const session = await getSession();
+  const sessionUserId = typeof session?.user?.id === "string" ? session.user.id : null;
+  if (sessionUserId) {
+    return sessionUserId;
+  }
+
+  const accessToken = await getAccessToken();
+  if (!accessToken) {
+    return null;
+  }
+
+  const payload = decodeJwtPayload(accessToken);
+  if (!payload || typeof payload !== "object") {
+    return null;
+  }
+
+  const candidate =
+    typeof payload.sub === "string"
+      ? payload.sub
+      : typeof payload.user_id === "string"
+        ? payload.user_id
+        : null;
+
+  return candidate;
+};