feat: 更新AI教练服务，支持处理多个图片URL，优化饮食分析逻辑。调整相关DTO以支持数组格式的图片URL，并修改默认视觉模型为'qwen-vl-max'。

src/ai-coach/ai-coach.controller.ts

@@ -42,7 +42,7 @@ export class AiCoachController {
         userId,
         conversationId,
         userContent,
-        imageUrl: body.imageUrl,
+        imageUrls: body.imageUrls,
       });
       let text = '';
       for await (const chunk of readable) {
@@ -62,7 +62,7 @@ export class AiCoachController {
       userId,
       conversationId,
       userContent,
-      imageUrl: body.imageUrl,
+      imageUrls: body.imageUrls,
     });
 
     readable.on('data', (chunk) => {

src/ai-coach/ai-coach.service.ts

@@ -103,7 +103,7 @@ export class AiCoachService {
     });
     // 默认选择通义千问对话模型（OpenAI兼容名），可通过环境覆盖
     this.model = this.configService.get<string>('DASHSCOPE_MODEL') || 'qwen-flash';
-    this.visionModel = this.configService.get<string>('DASHSCOPE_VISION_MODEL') || 'qwen-vl-plus';
+    this.visionModel = this.configService.get<string>('DASHSCOPE_VISION_MODEL') || 'qwen-vl-max';
   }
 
   async createOrAppendMessages(params: {
@@ -200,7 +200,7 @@ export class AiCoachService {
     conversationId: string;
     userContent: string;
     systemNotice?: string;
-    imageUrl?: string;
+    imageUrls?: string[];
   }): Promise<Readable> {
     // 解析指令（如果以 # 开头）
     const commandResult = this.parseCommand(params.userContent);
@@ -227,8 +227,8 @@ export class AiCoachService {
       }
     } else if (commandResult.command === 'diet') {
       // 使用视觉模型分析饮食图片
-      if (params.imageUrl) {
-        const dietAnalysis = await this.analyzeDietImage(params.imageUrl);
+      if (params.imageUrls) {
+        const dietAnalysis = await this.analyzeDietImage(params.imageUrls);
         messages.push({
           role: 'user',
           content: `用户通过拍照记录饮食，图片分析结果如下：\n${dietAnalysis}`
@@ -418,7 +418,7 @@ export class AiCoachService {
    * @param imageUrl 图片URL
    * @returns 饮食分析结果
    */
-  private async analyzeDietImage(imageUrl: string): Promise<string> {
+  private async analyzeDietImage(imageUrls: string[]): Promise<string> {
     try {
       const prompt = `请分析这张食物图片，识别其中的食物种类、分量，并提供以下信息：
 
@@ -445,11 +445,11 @@ export class AiCoachService {
             role: 'user',
             content: [
               { type: 'text', text: prompt },
-              { type: 'image_url', image_url: { url: imageUrl } as any },
+              ...imageUrls.map((imageUrl) => ({ type: 'image_url', image_url: { url: imageUrl } as any })),
             ] as any,
           },
         ],
-        temperature: 0,
+        temperature: 1,
       });
 
       this.logger.log(`diet image analysis result: ${completion.choices?.[0]?.message?.content}`);

src/ai-coach/dto/ai-chat.dto.ts

@@ -25,8 +25,9 @@ export class AiChatRequestDto {
 
   @ApiProperty({ required: false, description: '当用户要记体重时的图片URL（电子秤等）' })
   @IsOptional()
-  @IsString()
-  imageUrl?: string;
+  @IsArray()
+  @IsString({ each: true })
+  imageUrls?: string[];
 
   @ApiProperty({ required: false, description: '是否启用流式输出', default: true })
   @IsOptional()