feat: 项目负责人+内部任务群+portal 内部身份领取+群主链接归属

- 迁移 0012：projects.owner_userid / tasks.task_chat_id / claims.owner_partner_id
- lib/task-group-service.ts：懒建 appchat 任务群（首个内部群主领取时创建，成员 diff 补员），播报/卡片文案
- wecom-client 新增 appchat create/update/get/send 封装
- OAuth ticket 增可选 uid（v:1 兼容），内部成员领取按 wecom_userid 解析群主身份
- 外部 OAuth 领取人 upsert 打 partner_type='group_owner'
- portal 链接带 ?owner= 穿透 OAuth 往返，claims 记录归属群主
- 后台任务卡「群主链接」面板：复制链接/推送内部群主/任务群状态
- 催办与超期升级同步播报进任务群

lib/wecom-client.ts

@@ -96,7 +96,7 @@ function parseDueDays(value: string | undefined) {
   return Math.min(30, Math.floor(parsed));
 }
 
-function hasAppCredentials(config: WecomConfig) {
+export function hasAppCredentials(config: WecomConfig) {
   return Boolean(config.corpId && config.agentId && config.secret);
 }
 
@@ -635,3 +635,135 @@ export async function fetchWecomExternalContactName(
     return null;
   }
 }
+
+async function postAppChat(
+  config: WecomConfig,
+  path: string,
+  body: Record<string, unknown>,
+  errorLabel: string,
+  fetchImpl: FetchLike,
+): Promise<Record<string, unknown>> {
+  if (!hasAppCredentials(config)) {
+    throw new WecomClientError(
+      "企业微信自建应用未配置（WECOM_CORP_ID / WECOM_AGENT_ID / WECOM_SECRET）",
+      400,
+    );
+  }
+  const token = await fetchAccessToken(config, fetchImpl);
+  const url = `${WECOM_API_ORIGIN}${path}?access_token=${encodeURIComponent(token)}`;
+  const response = await fetchImpl(url, {
+    method: "POST",
+    headers: { "Content-Type": "application/json; charset=utf-8" },
+    body: JSON.stringify(body),
+    signal: AbortSignal.timeout(12_000),
+  });
+  const payload = await readEnvelope(response, errorLabel);
+  if (!response.ok) {
+    throw new WecomClientError(`${errorLabel}（HTTP ${response.status}）`, 502);
+  }
+  ensureOk(payload, errorLabel);
+  return payload;
+}
+
+export async function createAppChat(
+  config: WecomConfig,
+  params: { name: string; userlist: string[]; chatid: string },
+  fetchImpl: FetchLike = fetch,
+): Promise<{ chatid: string }> {
+  const userlist = params.userlist
+    .map((id) => bindingValue(id))
+    .filter((id) => id.length > 0);
+  if (userlist.length < 2) {
+    throw new WecomClientError("创建群聊会话至少需要 2 名成员", 400);
+  }
+  const chatid = bindingValue(params.chatid);
+  if (!chatid || chatid.length > 32) {
+    throw new WecomClientError("群聊 chatid 缺失或超过 32 字符", 400);
+  }
+  const name = bindingValue(params.name).slice(0, 20);
+  const payload = await postAppChat(
+    config,
+    "/cgi-bin/appchat/create",
+    { name, owner: Number(config.agentId), userlist, chatid },
+    "创建企业微信群聊会话失败",
+    fetchImpl,
+  );
+  return { chatid: bindingValue(payload.chatid) || chatid };
+}
+
+export async function updateAppChat(
+  config: WecomConfig,
+  params: {
+    chatid: string;
+    addUserList?: string[];
+    delUserList?: string[];
+  },
+  fetchImpl: FetchLike = fetch,
+): Promise<void> {
+  const body: Record<string, unknown> = {
+    chatid: bindingValue(params.chatid),
+  };
+  const addUserList = (params.addUserList ?? [])
+    .map((id) => bindingValue(id))
+    .filter((id) => id.length > 0);
+  const delUserList = (params.delUserList ?? [])
+    .map((id) => bindingValue(id))
+    .filter((id) => id.length > 0);
+  if (addUserList.length === 0 && delUserList.length === 0) return;
+  if (addUserList.length > 0) body.add_user_list = addUserList;
+  if (delUserList.length > 0) body.del_user_list = delUserList;
+  await postAppChat(
+    config,
+    "/cgi-bin/appchat/update",
+    body,
+    "更新企业微信群聊会话失败",
+    fetchImpl,
+  );
+}
+
+export async function getAppChat(
+  config: WecomConfig,
+  chatid: string,
+  fetchImpl: FetchLike = fetch,
+): Promise<{ chatId: string; name: string; userlist: string[] } | null> {
+  try {
+    const payload = await postAppChat(
+      config,
+      "/cgi-bin/appchat/get",
+      { chatid: bindingValue(chatid) },
+      "获取企业微信群聊会话失败",
+      fetchImpl,
+    );
+    const detail = payload.chat_info as
+      | { chatid?: unknown; name?: unknown; userlist?: unknown[] }
+      | undefined;
+    if (!detail) return null;
+    return {
+      chatId: bindingValue(detail.chatid),
+      name: bindingValue(detail.name),
+      userlist: Array.isArray(detail.userlist)
+        ? detail.userlist.map((id: unknown) => bindingValue(id)).filter(Boolean)
+        : [],
+    };
+  } catch {
+    return null;
+  }
+}
+
+export async function sendAppChatMessage(
+  config: WecomConfig,
+  params: { chatid: string; text: string },
+  fetchImpl: FetchLike = fetch,
+): Promise<void> {
+  const chatid = bindingValue(params.chatid);
+  const content = bindingValue(params.text);
+  if (!chatid || !content) return;
+  await postAppChat(
+    config,
+    "/cgi-bin/appchat/send",
+    { chatid, safe: 0, msgtype: "text", text: { content } },
+    "发送企业微信群聊消息失败",
+    fetchImpl,
+  );
+}
+