增加即梦图片5.0和视频2.5的能力

lib/server/seedream-billing.ts

@@ -0,0 +1,15 @@
+export const SEEDREAM_50_PRO_MODEL = "doubao-seedream-5-0-pro-260628";
+
+export function calculateSeedreamAmountFen(input: {
+  outputPriceFen: number;
+  referenceImageCount: number;
+  markupMultiplier: number;
+}): number {
+  if (!Number.isFinite(input.outputPriceFen) || input.outputPriceFen <= 0) throw new Error("Seedream 输出价格必须大于 0。");
+  if (!Number.isInteger(input.referenceImageCount) || input.referenceImageCount < 0 || input.referenceImageCount > 10) {
+    throw new Error("Seedream 参考图数量必须在 0 到 10 之间。");
+  }
+  if (!Number.isFinite(input.markupMultiplier) || input.markupMultiplier < 1) throw new Error("Seedream 上浮倍率不能低于 1.00。");
+  const extraInputPriceFen = Math.max(0, input.referenceImageCount - 1) * 2;
+  return Math.ceil((input.outputPriceFen + extraInputPriceFen) * input.markupMultiplier);
+}