严格区分Seedance视频模型

将画板生成视频默认模型调整为 seedance2.0-fast

为 seedance2.0 与 seedance2.0-fast 分别映射独立上游模型

固定角色动画使用 seedance2.0-fast 并更新前后端契约测试

同步更新编辑器生成面板和项目记忆文档

src/components/image-editor/ImageCanvasGenerationDialogModel.ts

@@ -17,6 +17,7 @@ import {
   DEFAULT_ICON_DESCRIPTIONS,
   DEFAULT_IMAGE_MODEL,
   DEFAULT_SPEC_FORM_VALUES,
+  DEFAULT_VIDEO_MODEL,
   EDITOR_IMAGE_DIMENSION_OPTIONS,
   EDITOR_VIDEO_MODEL_OPTIONS,
   ICON_DESCRIPTION_LIMIT,
@@ -203,7 +204,7 @@ export function createVideoGenerationDialogDraft({
     status: 'idle',
     composerOpen: true,
     generationReferences: [],
-    videoModel: EDITOR_VIDEO_MODEL_OPTIONS[0].value,
+    videoModel: DEFAULT_VIDEO_MODEL,
     videoAspectRatio: '16:9',
     videoResolution: '480p',
     videoDurationSeconds: 4,