fix: use grok-imagine-1.0-edit model for grok2 image editing with reference images

src/lib/model-gateway/openai-compat/image.ts

@@ -6,6 +6,7 @@ import {
   resolveOpenAICompatClientConfig,
   toUploadFile,
 } from './common'
+import { getProviderKey } from '@/lib/api-config'
 
 type OpenAIImageResponseFormat = 'url' | 'b64_json'
 type OpenAIImageOutputFormat = 'png' | 'jpeg' | 'webp'
@@ -154,13 +155,13 @@ export async function generateImageViaOpenAICompat(request: OpenAICompatImageReq
   const rawSize = resolveRawSize(options)
   const size = normalizeOpenAIImageSize(rawSize)
 
-  // Grok2 暂不支持图片编辑接口，忽略参考图
-  const providerKey = providerId.split('-')[0]
-  const shouldUseReferenceImages = referenceImages.length > 0 && providerKey !== 'grok2'
+  // grok2 图片编辑需使用专用 edit 模型
+  const providerKey = getProviderKey(providerId)
+  const editModelId = providerKey === 'grok2' ? 'grok-imagine-1.0-edit' : normalizedModelId
 
-  if (shouldUseReferenceImages) {
+  if (referenceImages.length > 0) {
     const response = await client.images.edit({
-      model: normalizedModelId,
+      model: editModelId,
       prompt,
       image: await Promise.all(referenceImages.map((image, index) => toUploadFile(image, index))),
       response_format: responseFormat,