feat: add admin accounts and image templates

lib/prompt/material-placeholders.ts

@@ -0,0 +1,35 @@
+export type MaterialPlaceholder = {
+  token: string;
+  type: "image" | "video" | "audio";
+  index: number;
+};
+
+const materialTokenPattern = /@(参考视频|图片|图|视频|音频)(\d+)/g;
+
+export function extractMaterialPlaceholders(prompt: string): MaterialPlaceholder[] {
+  const placeholders: MaterialPlaceholder[] = [];
+  const seen = new Set<string>();
+  for (const match of prompt.matchAll(materialTokenPattern)) {
+    const kind = match[1];
+    const index = Number(match[2]);
+    if (!Number.isInteger(index) || index < 1) continue;
+    const type = typeForKind(kind);
+    const token = labelForPlaceholder(type, index);
+    if (seen.has(token)) continue;
+    seen.add(token);
+    placeholders.push({ token, type, index });
+  }
+  return placeholders;
+}
+
+function typeForKind(kind: string): MaterialPlaceholder["type"] {
+  if (kind === "视频" || kind === "参考视频") return "video";
+  if (kind === "音频") return "audio";
+  return "image";
+}
+
+function labelForPlaceholder(type: MaterialPlaceholder["type"], index: number) {
+  if (type === "video") return `@视频${index}`;
+  if (type === "audio") return `@音频${index}`;
+  return `@图片${index}`;
+}