feat: 项目层级树+合作方绑定KOC资源+客户群全量可选+精简编辑表单，移除复盘报表

- 项目支持父子层级：树形折叠展示、详情面板内联管理总群成员、推送聚合子项目任务、环检测与子项目删除守卫
- 外部KOC合作方绑定 KOC 资源账号（唯一占用、换绑/解绑、资源页一键设为合作方），列表直显联系方式
- 绑定客户群改为全量外部群缓存（含各群主），同步按钮强刷；member_count 缺失以 member_list 兜底
- 任务/项目编辑模式隐藏不可变字段（平台/内容类型/品牌/总群成员），详情面板维护成员时保留 parent_id
- 删除复盘报表整栏（导航/页面/task_report_list/导出路由/CSV lib 及测试）

tests/wecom-client.test.mjs

@@ -539,6 +539,32 @@ test("listCustomerGroupChats paginates groupchat/list and keeps only normal grou
   assert.equal(secondBody.cursor, "page-2");
 });
 
+test("listCustomerGroupChats derives memberCount from member_list when member_count absent", async () => {
+  const { fetchImpl } = fakeGroupPush({
+    pages: [{ next_cursor: "", group_chat_list: [{ chat_id: "wr-normal-1", status: 0 }] }],
+    details: {
+      "wr-normal-1": {
+        name: "",
+        owner: "zhangsan",
+        member_list: [
+          { type: 1, userid: "zhangsan" },
+          { type: 1, userid: "lisi" },
+          { type: 2, userid: "wm external 1" },
+          { type: 2, userid: "wm external 2" },
+          { type: 2, userid: "wm external 3" },
+        ],
+      },
+    },
+  });
+  const groups = await listCustomerGroupChats(
+    resolveWecomConfig(baseBindings),
+    fetchImpl,
+  );
+  assert.equal(groups.length, 1);
+  assert.equal(groups[0].name, "");
+  assert.equal(groups[0].memberCount, 5, "member_count falls back to member_list length");
+});
+
 test("listCustomerGroupChats skips groups whose detail lookup fails", async () => {
   const { fetchImpl } = fakeGroupPush({
     pages: [