feat: deliver AI drama production demo

tests/normalize.test.mjs

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+import test from "node:test";
+import assert from "node:assert/strict";
+import {
+  extractVideoTaskId,
+  extractVideoUrl,
+  normalizeAssetReference,
+  normalizeVideoStatus,
+} from "../lib/normalize.mjs";
+
+test("素材审核返回值统一为 asset 协议并保留大小写", () => {
+  assert.equal(normalizeAssetReference({ asset_url: "Asset://asset-1" }), "asset://asset-1");
+  assert.equal(normalizeAssetReference({ downstream_asset_id: "asset-2" }), "asset://asset-2");
+  assert.equal(normalizeAssetReference({ Id: "asset-3" }), "asset://asset-3");
+  assert.equal(normalizeAssetReference({ asset_id: "mat_ADyx4iQv" }), "asset://mat_ADyx4iQv");
+});
+
+test("兼容视频任务 id 和状态字段", () => {
+  assert.equal(extractVideoTaskId({ task_id: "task-1" }), "task-1");
+  assert.equal(extractVideoTaskId({ data: { id: "task-2" } }), "task-2");
+  assert.equal(normalizeVideoStatus({ status: "succeeded" }), "completed");
+  assert.equal(normalizeVideoStatus({ data: { status: "failed" } }), "failed");
+});
+
+test("从常见响应位置提取视频地址", () => {
+  assert.equal(extractVideoUrl({ output: { video_url: "https://example.com/demo.mp4" } }), "https://example.com/demo.mp4");
+});