debug: 添加阿里生图消息格式调试日志

lib/ai/providers/alibaba-image.ts

@@ -292,6 +292,8 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
         console.log("[Alibaba Image] doGenerate called");
         console.log("[Alibaba Image] Model:", modelId);
         console.log("[Alibaba Image] Image params:", options.imageParams);
+        console.log("[Alibaba Image] Messages count:", options.messages.length);
+        console.log("[Alibaba Image] Messages:", JSON.stringify(options.messages, null, 2));
         
         try {
           // 提取最后一条用户消息
@@ -300,6 +302,8 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
             throw new Error("No user message found");
           }
           
+          console.log("[Alibaba Image] Last user message:", JSON.stringify(lastUserMessage, null, 2));
+          
           // 解析消息内容
           let prompt = "";
           const imageUrls: string[] = [];