修复图片改造尺寸保持

保持图片改造提交与画布回填的原图尺寸
在 VectorEngine 边界对齐非 16 倍数参考图并恢复目标尺寸
补充前后端回归测试与编辑器尺寸契约文档

src/components/image-editor/useImageCanvasGenerationSubmissionWorkflow.ts

@@ -1268,12 +1268,11 @@ export function useImageCanvasGenerationSubmissionWorkflow({
         quickEditSourceLayer.originalWidth,
         quickEditSourceLayer.originalHeight,
       );
-    const quickEditOutputSize = resolveEditorImageGenerationPixelSize({
-      model: quickEditPanel.model,
-      aspectRatio: quickEditAspectRatio,
-      imageSize: quickEditImageSize,
-    });
-    const quickEditSize = `${quickEditOutputSize.width}x${quickEditOutputSize.height}`;
+    const quickEditOutputSize = {
+      width: quickEditSourceLayer.originalWidth,
+      height: quickEditSourceLayer.originalHeight,
+    };
+    const quickEditSize = `${quickEditSourceLayer.originalWidth}x${quickEditSourceLayer.originalHeight}`;
     const basePrompt =
       quickEditPanel.prompt.trim() ||
       (panelMode === 'redraw' ? '重绘图片' : '快速编辑图片');
@@ -1678,6 +1677,7 @@ export function useImageCanvasGenerationSubmissionWorkflow({
             editEditorImage({
               prompt: submissionPlan.normalizedPrompt,
               sourceImageSrc: referenceImageSrc,
+              size: `${submissionPlan.sourceLayer.originalWidth}x${submissionPlan.sourceLayer.originalHeight}`,
               projectId,
               assetKind: submissionPlan.sourceLayer.assetKind,
               generationInputs: submissionPlan.generationInputs,