新增训练计划模块，包括控制器、服务、模型及数据传输对象，更新应用模块以引入新模块，同时在AI教练模块中添加体态评估功能，支持体重识别与更新，优化用户体重历史记录管理。

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

@@ -6,6 +6,7 @@ import { CurrentUser } from '../common/decorators/current-user.decorator';
 import { AccessTokenPayload } from '../users/services/apple-auth.service';
 import { AiCoachService } from './ai-coach.service';
 import { AiChatRequestDto, AiChatResponseDto } from './dto/ai-chat.dto';
+import { PostureAssessmentRequestDto, PostureAssessmentResponseDto } from './dto/posture-assessment.dto';
 
 @ApiTags('ai-coach')
 @Controller('ai-coach')
@@ -31,19 +32,30 @@ export class AiCoachController {
       userContent: body.messages?.[body.messages.length - 1]?.content || '',
     });
 
+    // 智能体重识别：若疑似“记体重”且传入图片，则优先识别并更新体重
+    let weightInfo: { weightKg?: number } = {};
+    try {
+      weightInfo = await this.aiCoachService.maybeExtractAndUpdateWeight(
+        userId,
+        body.imageUrl,
+        body.messages?.[body.messages.length - 1]?.content,
+      );
+    } catch { }
+
     if (!stream) {
       // 非流式：聚合后一次性返回文本
       const readable = await this.aiCoachService.streamChat({
         userId,
         conversationId,
         userContent: body.messages?.[body.messages.length - 1]?.content || '',
+        systemNotice: weightInfo.weightKg ? `系统提示：已从图片识别体重为${weightInfo.weightKg}kg，并已为你更新到个人资料。` : undefined,
       });
       let text = '';
       for await (const chunk of readable) {
         text += chunk.toString();
       }
       res.setHeader('Content-Type', 'application/json; charset=utf-8');
-      res.send({ conversationId, text });
+      res.send({ conversationId, text, weightKg: weightInfo.weightKg });
       return;
     }
 
@@ -56,9 +68,12 @@ export class AiCoachController {
       userId,
       conversationId,
       userContent: body.messages?.[body.messages.length - 1]?.content || '',
+      systemNotice: weightInfo.weightKg ? `系统提示：已从图片识别体重为${weightInfo.weightKg}kg，并已为你更新到个人资料。` : undefined,
     });
 
     readable.on('data', (chunk) => {
+      // 流水首段可提示体重已更新
+      // 简化处理：服务端不额外注入推送段，直接靠 systemNotice
       res.write(chunk);
     });
     readable.on('end', () => {
@@ -101,6 +116,24 @@ export class AiCoachController {
     const ok = await this.aiCoachService.deleteConversation(user.sub, conversationId);
     return { success: ok };
   }
+
+  @Post('posture-assessment')
+  @ApiOperation({ summary: 'AI体态评估' })
+  @ApiBody({ type: PostureAssessmentRequestDto })
+  async postureAssessment(
+    @Body() body: PostureAssessmentRequestDto,
+    @CurrentUser() user: AccessTokenPayload,
+  ): Promise<PostureAssessmentResponseDto> {
+    const res = await this.aiCoachService.assessPosture({
+      userId: user.sub,
+      frontImageUrl: body.frontImageUrl,
+      sideImageUrl: body.sideImageUrl,
+      backImageUrl: body.backImageUrl,
+      heightCm: body.heightCm,
+      weightKg: body.weightKg,
+    });
+    return res as any;
+  }
 }