增加即梦的生图和生视频功能

tests/video-settings.test.ts

@@ -32,6 +32,7 @@ describe("video settings", () => {
     expect(normalizeVideoRatio("21:9")).toBe("21:9");
     expect(normalizeVideoRatio("bad-ratio")).toBe("9:16");
     expect(normalizeVideoResolution("1080p", "doubao-seedance-2-0-260128")).toBe("1080p");
+    expect(normalizeVideoResolution("4k", "doubao-seedance-2-0-260128")).toBe("720p");
     expect(normalizeVideoResolution("1080p", "doubao-seedance-2-0-fast-260128")).toBe("720p");
   });
 });