支持规范参考图输入

为角色形象规范、UI素材规范、自定义规范面板新增参考图上传入口。

生成规范时携带参考图并自动追加参考图生成规范语义。

补充生成流程和上传流程回归测试。

更新画板角色形象生成入口设计文档。

src/components/image-editor/useImageCanvasGenerationWorkflow.ts

@@ -827,19 +827,30 @@ export function useImageCanvasGenerationWorkflow({
           const specType = dialog.specType ?? 'custom';
           const specValues =
             dialog.specValues ?? DEFAULT_SPEC_FORM_VALUES[specType];
-          const specPrompt = buildSpecPrompt(specType, specValues);
+          const specPrompt = buildSpecPrompt(
+            specType,
+            specValues,
+            Boolean(dialog.specReference?.src),
+          );
           const generated = await generateEditorImage({
             prompt: specPrompt,
             size: SPEC_GENERATION_SIZE,
             model: DEFAULT_IMAGE_MODEL,
             kind: 'spec',
+            ...(dialog.specReference?.src
+              ? { referenceImageSrcs: [dialog.specReference.src] }
+              : {}),
           });
           addGeneratedResultLayer(generated, {
             frame: getGeneratingDialogPlaceholder(dialog),
             assetKind: specType === 'icon' ? 'icon-spec' : 'spec',
             title: `${SPEC_TYPE_LABEL[specType]} ${layerCounterRef.current + 1}`,
             dialogId: canvasDialog?.id,
-            generationInputs: buildSpecGenerationInputs(specType, specValues),
+            generationInputs: buildSpecGenerationInputs(
+              specType,
+              specValues,
+              dialog.specReference,
+            ),
           });
         } else if (dialog.mode === 'character') {
           const referenceImageSrcs = [