production runtime and mock removal

lib/bailian/client.ts

@@ -28,12 +28,6 @@ export function deriveBailianNativeBaseUrl(baseUrl: string) {
   return baseUrl.replace(/\/+$/, "").replace(/\/compatible-mode\/v1$/i, "");
 }
 
-export function shouldMockBailian() {
-  const flag = (process.env.BAILIAN_MOCK || "auto").trim().toLowerCase();
-  if (flag === "1" || flag === "true") return true;
-  return false;
-}
-
 export function buildBailianImagePayload(capability: EnabledImageCapability, input: Record<string, unknown>) {
   if (capability !== "image.generate") throw new Error("百炼渠道当前仅支持图片生成与参考图生图。");
   const prompt = String(input.prompt || "").trim();