合并前端历史图片模型判定与归一

抽取 LEGACY_EDITOR_IMAGE_MODELS 作为单一来源

normalizeEditorImageModel 与 isLegacyEditorImageModel 复用该集合

src/components/image-editor/ImageCanvasGenerationModel.ts

@@ -53,6 +53,11 @@ const IMAGE_MODEL_NANOBANANA_ALIASES = new Set([
   'nanobanana2',
   'nano-banana',
 ]);
+// 历史 GPT Image 2 别名统一映射到当前业务模型，判定与归一复用同一集合。
+const LEGACY_EDITOR_IMAGE_MODELS = new Set([
+  IMAGE_MODEL_GPT_IMAGE_2,
+  IMAGE_MODEL_GPT_IMAGE_2_C,
+]);
 export const SPEC_GENERATION_MODEL = IMAGE_MODEL_GPT_IMAGE_2_5;
 export const SPEC_GENERATION_ASPECT_RATIO = '16:9';
 export const SPEC_GENERATION_IMAGE_SIZE = '2K';
@@ -639,21 +644,14 @@ export function normalizeEditorImageModel(model: string | null | undefined) {
   if (IMAGE_MODEL_NANOBANANA_ALIASES.has(normalizedModel)) {
     return IMAGE_MODEL_NANOBANANA2;
   }
-  if (
-    normalizedModel === IMAGE_MODEL_GPT_IMAGE_2 ||
-    normalizedModel === IMAGE_MODEL_GPT_IMAGE_2_C
-  ) {
+  if (LEGACY_EDITOR_IMAGE_MODELS.has(normalizedModel)) {
     return IMAGE_MODEL_GPT_IMAGE_2_5;
   }
   return normalizedModel;
 }
 
 export function isLegacyEditorImageModel(model: string | null | undefined) {
-  const normalizedModel = model?.trim();
-  return (
-    normalizedModel === IMAGE_MODEL_GPT_IMAGE_2 ||
-    normalizedModel === IMAGE_MODEL_GPT_IMAGE_2_C
-  );
+  return LEGACY_EDITOR_IMAGE_MODELS.has(model?.trim() ?? '');
 }
 
 export function getEditorImageModelDisplayName(