feat: label image references in generation

web/src/lib/image-reference-prompt.ts

@@ -0,0 +1,12 @@
+import type { ReferenceImage } from "@/types/image";
+
+export function imageReferenceLabel(index: number) {
+    return `图片${index + 1}`;
+}
+
+export function buildImageReferencePromptText(prompt: string, references: ReferenceImage[]) {
+    const text = prompt.trim();
+    if (!references.length) return text;
+    const labels = references.map((_, index) => imageReferenceLabel(index));
+    return `参考图片编号：${labels.join("、")}。请按这些编号理解提示词中的图片引用。\n\n${text}`;
+}