feat: 接入企业微信通知（临期催办 + 群机器人汇总）

新增 lib/wecom-client.ts 与 lib/wecom-notifier-service.ts，支持
群机器人 webhook 与应用消息双通道；scheduler 加入临期 N 天催办
与每日管理员汇总；action 路由补 bind_wecom_external_id 与
send_test_wecom 两个管理端动作，配套测试。

app/api/action/route.ts

@@ -37,6 +37,13 @@ import {
   DistributionReleaseError,
   releaseUnfinishedDistribution,
 } from "../../../lib/distribution-release-service";
+import {
+  resolveWecomConfig,
+  sendWecomAppMessage,
+  sendWecomRobotMessage,
+  WecomClientError,
+  type WecomBindings,
+} from "../../../lib/wecom-client";
 import { isManagerRequest } from "../../../lib/user-auth";
 import { extractPublishUrl } from "../../../lib/publish-url";
 
@@ -534,6 +541,66 @@ export async function POST(request: Request) {
         )
         .bind(exposure, views, distributionId)
         .run();
+    } else if (body.action === "bind_wecom_external_id") {
+      const partnerId = String(body.partnerId ?? "").trim().slice(0, 80);
+      const externalId = String(body.wecomExternalUserId ?? "")
+        .trim()
+        .slice(0, 128);
+      if (!partnerId) {
+        return Response.json(
+          { error: "缺少 partnerId" },
+          { status: 400 },
+        );
+      }
+      await db
+        .prepare(
+          "UPDATE partners SET wecom_external_user_id = ? WHERE id = ?",
+        )
+        .bind(externalId || null, partnerId)
+        .run();
+      return Response.json({
+        partnerId,
+        wecomExternalUserId: externalId || null,
+      });
+    } else if (body.action === "send_test_wecom") {
+      const wecomConfig = resolveWecomConfig(
+        env as unknown as WecomBindings,
+      );
+      const partnerId = String(body.partnerId ?? "").trim();
+      let partnerExternalId: string | null = null;
+      if (partnerId) {
+        const row = await db
+          .prepare(
+            "SELECT wecom_external_user_id FROM partners WHERE id = ?",
+          )
+          .bind(partnerId)
+          .first<{ wecom_external_user_id: string | null }>();
+        partnerExternalId = row?.wecom_external_user_id ?? null;
+      }
+      const testContent = `[KOC LOOP 测试] 群机器人连通性正常，时间 ${new Date().toISOString()}`;
+      let robotStatus: "ok" | "skipped" = "skipped";
+      if (wecomConfig.robotWebhook) {
+        await sendWecomRobotMessage(testContent, wecomConfig);
+        robotStatus = "ok";
+      }
+      let appStatus: "ok" | "skipped" | "failed" = "skipped";
+      if (
+        partnerExternalId &&
+        wecomConfig.corpId &&
+        wecomConfig.agentId &&
+        wecomConfig.secret
+      ) {
+        const result = await sendWecomAppMessage(
+          [partnerExternalId],
+          testContent,
+          wecomConfig,
+        );
+        appStatus = result.failed > 0 ? "failed" : "ok";
+      }
+      return Response.json({
+        robot: robotStatus,
+        app: appStatus,
+      });
     } else {
       return Response.json({ error: "不支持的操作" }, { status: 400 });
     }
@@ -545,7 +612,8 @@ export async function POST(request: Request) {
       {
         status:
           error instanceof FeishuSourceError ||
-          error instanceof DistributionReleaseError
+          error instanceof DistributionReleaseError ||
+          error instanceof WecomClientError
             ? error.status
             : 500,
       },