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-notifier-service.ts

@@ -6,6 +6,7 @@ import {
   sendWecomTemplateCard,
   type WecomConfig,
 } from "./wecom-client";
+import { sendTaskChatMessage } from "./task-group-service";
 import { getRuntimeEnv } from "./runtime-env";
 import { releaseUnfinishedDistribution } from "./distribution-release-service";
 
@@ -24,6 +25,7 @@ type DueSoonRow = {
   partner_id: string;
   partner_name: string;
   wecom_external_user_id: string | null;
+  task_id: string;
   task_name: string;
   due_at: string;
   content_title: string;
@@ -56,6 +58,7 @@ export async function runDueSoonWecomNotifications(
         d.partner_id,
         p.name AS partner_name,
         p.wecom_external_user_id,
+        t.id AS task_id,
         t.name AS task_name,
         t.due_at,
         c.title AS content_title
@@ -140,6 +143,31 @@ export async function runDueSoonWecomNotifications(
     );
   }
 
+  const byTask = new Map<
+    string,
+    { taskName: string; dueAt: string; rows: DueSoonRow[] }
+  >();
+  for (const row of result.results) {
+    const entry = byTask.get(row.task_id) ?? {
+      taskName: row.task_name,
+      dueAt: row.due_at,
+      rows: [],
+    };
+    entry.rows.push(row);
+    byTask.set(row.task_id, entry);
+  }
+  for (const [taskId, entry] of byTask) {
+    const partners = [...new Set(entry.rows.map((row) => row.partner_name))];
+    const overflow = partners.length > 5 ? ` 等 ${partners.length} 位` : "";
+    await sendTaskChatMessage(
+      db,
+      taskId,
+      `【催办】《${truncate(entry.taskName, 24)}》有 ${entry.rows.length} 条内容待发布（截止 ${entry.dueAt}）：\n${partners.slice(0, 5).join("、")}${overflow}`,
+      config,
+      fetchImpl,
+    );
+  }
+
   let digestSent = false;
   if (config.robotWebhook && digestTasks.length > 0) {
     const digest =
@@ -276,6 +304,13 @@ export async function runOverdueEscalation(
   const env = getRuntimeEnv();
   const cardUrl = bindingValue(env.APP_ORIGIN) || bindingValue(env.KOC_PORTAL_URL);
   for (const [taskId, entry] of byTask) {
+    await sendTaskChatMessage(
+      db,
+      taskId,
+      `【超期催办】《${truncate(entry.taskName, 24)}》（截止 ${entry.dueAt}）有 ${entry.count} 条内容超期未发布，请跟进催办或释放。`,
+      config,
+      fetchImpl,
+    );
     if (!entry.projectId) continue;
     try {
       const project = await db