fix: support scale adjust provider mask params

lib/ai/providers/openai-image.ts

@@ -19,6 +19,7 @@ export interface OpenAIImageParams {
   quality?: string;
   background?: string;
   outputFormat?: string;
+  maskImageUrl?: string;
 }
 
 interface UploadedImage {
@@ -643,6 +644,7 @@ async function requestOpenAIImageGeneration(params: {
   aspectRatio?: string;
   imageSizeLabel?: "1K" | "2K" | "4K";
   imageUrls: string[];
+  maskImageUrl?: string;
   quality?: string;
   background?: string;
   outputFormat?: string;
@@ -656,6 +658,7 @@ async function requestOpenAIImageGeneration(params: {
     aspectRatio,
     imageSizeLabel,
     imageUrls,
+    maskImageUrl,
     quality,
     background,
     outputFormat,
@@ -723,6 +726,10 @@ async function requestOpenAIImageGeneration(params: {
           formData.append("image[]", new Blob([image.buffer], { type: image.mimeType }), image.filename);
         }
       }
+      if (maskImageUrl) {
+        const mask = await loadInputImage(maskImageUrl);
+        formData.append("mask", new Blob([mask.buffer], { type: mask.mimeType }), mask.filename);
+      }
 
       const response = await fetch(endpoint, {
         method: "POST",
@@ -898,6 +905,7 @@ export function createOpenAIImage({ apiKey, baseURL }: OpenAIImageConfig) {
           timeoutMs: resolveRequestTimeoutMs(baseURL, imageSize, activeModelId),
           useBltcyImageCompatParams: shouldUseBltcyImageCompatParams(baseURL),
           imageCount: imageUrls.length,
+          hasMask: Boolean(options.imageParams?.maskImageUrl),
           baseURL: normalizeBaseURL(baseURL),
         });
 
@@ -910,6 +918,7 @@ export function createOpenAIImage({ apiKey, baseURL }: OpenAIImageConfig) {
           aspectRatio: aspectRatio || undefined,
           imageSizeLabel: imageSize,
           imageUrls,
+          maskImageUrl: options.imageParams?.maskImageUrl,
           quality,
           background,
           outputFormat,