fix(gateway): route local L2 timers to scene extraction

Signed-off-by: Ziyang Guo <121015044+RerankerGuo@users.noreply.github.com>

src/gateway/timer-routing.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from "vitest";
+import { createLocalTimerTask } from "./timer-routing.js";
+
+describe("createLocalTimerTask", () => {
+  it("routes legacy L2_schedule timers to the scene extraction L2 worker", () => {
+    const task = createLocalTimerTask({
+      entry: { member: "session-a:L2_schedule", fireAtMs: 123 },
+      defaultInstanceId: "default-inst",
+      now: 456,
+    });
+
+    expect(task).toMatchObject({
+      id: "L2-session-a-456",
+      type: "L2",
+      instanceId: "default-inst",
+      sessionId: "session-a",
+      priority: 0,
+      createdAt: 456,
+      data: {
+        triggeredBy: "timer_scanner",
+        timerMember: "session-a:L2_schedule",
+        instanceId: "default-inst",
+        targetMmdFile: undefined,
+      },
+    });
+  });
+
+  it("routes legacy L1_idle timers to the normal L1 worker", () => {
+    const task = createLocalTimerTask({
+      entry: { member: "session-a:L1_idle", fireAtMs: 123 },
+      defaultInstanceId: "default-inst",
+      now: 456,
+    });
+
+    expect(task.type).toBe("L1");
+    expect(task.id).toBe("L1-session-a-456");
+    expect(task.sessionId).toBe("session-a");
+  });
+
+  it("keeps explicit offload-l2 timers on the offload worker", () => {
+    const task = createLocalTimerTask({
+      entry: {
+        member: "offload-l2:tenant-1:session-a:123456-topic.mmd",
+        fireAtMs: 123,
+      },
+      defaultInstanceId: "default-inst",
+      now: 456,
+    });
+
+    expect(task).toMatchObject({
+      id: "offload-l2-session-a-456",
+      type: "offload-l2",
+      instanceId: "tenant-1",
+      sessionId: "session-a",
+      data: {
+        timerMember: "offload-l2:tenant-1:session-a:123456-topic.mmd",
+        instanceId: "tenant-1",
+        targetMmdFile: "123456-topic.mmd",
+      },
+    });
+  });
+});