fix: 催办按任务类型分流 + 领取事务加锁防超发

- 临期/超期/自动释放查询按 task_type 区分完成口径：内容任务看 publish_url，截图任务看 result_submitted_at，截图任务不再被永久误判为未发布
- portal 领取改为事务内 SELECT ... FOR UPDATE 锁定可用内容，消除并发领取超发窗口

tests/wecom-escalation.test.mjs

@@ -26,6 +26,9 @@ const overdueRows = [
     task_id: "task-A",
     task_name: "超期任务A",
     due_at: "2026-08-20",
+    task_type: "content_publish",
+    publish_url: null,
+    result_submitted_at: null,
     project_id: "proj-1",
     partner_id: "p-1",
     partner_name: "合作方甲",
@@ -35,6 +38,9 @@ const overdueRows = [
     task_id: "task-A",
     task_name: "超期任务A",
     due_at: "2026-08-20",
+    task_type: "content_publish",
+    publish_url: null,
+    result_submitted_at: null,
     project_id: "proj-1",
     partner_id: "p-2",
     partner_name: "合作方乙",
@@ -44,6 +50,9 @@ const overdueRows = [
     task_id: "task-B",
     task_name: "无项目任务B",
     due_at: "2026-08-25",
+    task_type: "content_publish",
+    publish_url: null,
+    result_submitted_at: null,
     project_id: "",
     partner_id: "p-3",
     partner_name: "合作方丙",
@@ -64,6 +73,15 @@ const releasableDistribution = {
   result_submitted_at: null,
 };
 
+function filterOverdue(rows, cutoff) {
+  return rows.filter((row) => {
+    if (!(row.due_at && row.due_at < cutoff)) return false;
+    return row.task_type === "screenshot_collect"
+      ? !row.result_submitted_at
+      : !row.publish_url;
+  });
+}
+
 function fakeEscalationDb({ rows = overdueRows } = {}) {
   return {
     prepare(sql) {
@@ -77,8 +95,11 @@ function fakeEscalationDb({ rows = overdueRows } = {}) {
               return null;
             },
             async all() {
-              if (/FROM distributions d/.test(sql) && /publish_url IS NULL/.test(sql)) {
-                return { results: rows.filter((row) => row.due_at < params[0]) };
+              if (
+                /FROM distributions d/.test(sql) &&
+                /result_submitted_at IS NULL/.test(sql)
+              ) {
+                return { results: filterOverdue(rows, params[0]) };
               }
               return { results: [] };
             },
@@ -117,8 +138,11 @@ function fakeReleaseDb({ rows = overdueRows, blockedIds = [] } = {}) {
               return null;
             },
             async all() {
-              if (/FROM distributions d/.test(sql) && /publish_url IS NULL/.test(sql)) {
-                return { results: rows.filter((row) => row.due_at < params[0]) };
+              if (
+                /FROM distributions d/.test(sql) &&
+                /result_submitted_at IS NULL/.test(sql)
+              ) {
+                return { results: filterOverdue(rows, params[0]) };
               }
               return { results: [] };
             },
@@ -226,6 +250,75 @@ test("runOverdueEscalation no-ops without overdue rows", async () => {
   assert.equal(calls.length, 0);
 });
 
+test("runOverdueEscalation distinguishes screenshot tasks from content tasks", async () => {
+  const rows = [
+    {
+      id: "d-s1",
+      task_id: "task-S",
+      task_name: "截图任务S",
+      due_at: "2026-08-20",
+      task_type: "screenshot_collect",
+      publish_url: null,
+      result_submitted_at: null,
+      project_id: "",
+      partner_id: "p-1",
+      partner_name: "合作方甲",
+    },
+    {
+      id: "d-s2",
+      task_id: "task-S",
+      task_name: "截图任务S",
+      due_at: "2026-08-20",
+      task_type: "screenshot_collect",
+      publish_url: null,
+      result_submitted_at: "2026-08-21 09:00:00",
+      project_id: "",
+      partner_id: "p-2",
+      partner_name: "合作方乙",
+    },
+    {
+      id: "d-c1",
+      task_id: "task-A",
+      task_name: "内容任务A",
+      due_at: "2026-08-20",
+      task_type: "content_publish",
+      publish_url: "https://www.xiaohongshu.com/note/1",
+      result_submitted_at: null,
+      project_id: "",
+      partner_id: "p-3",
+      partner_name: "合作方丙",
+    },
+    {
+      id: "d-c2",
+      task_id: "task-A",
+      task_name: "内容任务A",
+      due_at: "2026-08-20",
+      task_type: "content_publish",
+      publish_url: null,
+      result_submitted_at: null,
+      project_id: "",
+      partner_id: "p-4",
+      partner_name: "合作方丁",
+    },
+  ];
+  const calls = [];
+  const summary = await runOverdueEscalation(
+    fakeEscalationDb({ rows }),
+    config,
+    wecomFetch(calls),
+    NOW,
+  );
+  // 已提交截图的 d-s2 与已回填链接的 d-c1 不算超期
+  assert.equal(summary.overdueTasks, 2);
+  assert.equal(summary.overdueDistributions, 2);
+  const robotBodies = calls
+    .filter((call) => call.url.host === "qyapi.example.com")
+    .map((call) => JSON.parse(String(call.init.body)));
+  assert.equal(robotBodies.length, 1);
+  assert.match(robotBodies[0].text.content, /截图任务S（截止 2026-08-20）：1 条/);
+  assert.match(robotBodies[0].text.content, /内容任务A（截止 2026-08-20）：1 条/);
+});
+
 test("runOverdueAutoRelease is disabled without env switch", async () => {
   const calls = [];
   const db = fakeReleaseDb();