新增普拉提训练系统的数据库结构和数据导入功能

- 创建普拉提分类和动作数据的SQL导入脚本，支持垫上普拉提和器械普拉提的分类管理
- 实现数据库结构迁移脚本，添加新字段以支持普拉提类型和器械名称
- 更新数据库升级总结文档，详细说明数据库结构变更和数据导入步骤
- 创建训练会话相关表，支持每日训练实例功能
- 引入训练会话管理模块，整合训练计划与实际训练会话的关系

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

@@ -306,6 +306,168 @@ export class AiCoachService {
       return {};
     }
   }
+
+  /**
+   * 从用户文本中识别体重信息
+   * 支持多种格式：65kg、65公斤、65.5kg、体重65等
+   */
+  private extractWeightFromText(text: string | undefined): number | null {
+    if (!text) return null;
+
+    const t = text.toLowerCase();
+
+    // 匹配各种体重格式的正则表达式
+    const patterns = [
+      /(?:体重|称重|秤|重量|weight).*?(\d+(?:\.\d+)?)\s*(?:kg|公斤|千克)/i,
+      /(\d+(?:\.\d+)?)\s*(?:kg|公斤|千克)/i,
+      /(?:体重|称重|秤|重量|weight).*?(\d+(?:\.\d+)?)/i,
+      /我(?:现在|今天)?(?:体重|重量|称重)?(?:是|为|有)?(\d+(?:\.\d+)?)/i,
+    ];
+
+    for (const pattern of patterns) {
+      const match = t.match(pattern);
+      if (match) {
+        const weight = parseFloat(match[1]);
+        // 合理的体重范围检查 (20-400kg)
+        if (weight >= 20 && weight <= 400) {
+          return weight;
+        }
+      }
+    }
+
+    return null;
+  }
+
+  /**
+   * 获取用户体重历史记录
+   */
+  async getUserWeightHistory(userId: string, limit: number = 10): Promise<{
+    currentWeight?: number;
+    history: Array<{ weight: number; source: string; createdAt: Date }>;
+  }> {
+    try {
+      // 获取当前体重
+      const profile = await UserProfile.findOne({ where: { userId } });
+      const currentWeight = profile?.weight;
+
+      // 获取体重历史
+      const history = await this.usersService.getWeightHistory(userId, { limit });
+
+      return {
+        currentWeight: currentWeight || undefined,
+        history
+      };
+    } catch (error) {
+      this.logger.error(`获取用户体重历史失败: ${error instanceof Error ? error.message : String(error)}`);
+      return { history: [] };
+    }
+  }
+
+  /**
+   * 构建体重更新的系统提示信息
+   */
+  private buildWeightUpdateSystemNotice(
+    newWeight: number,
+    currentWeight?: number,
+    history: Array<{ weight: number; source: string; createdAt: Date }> = []
+  ): string {
+    let notice = `系统提示：已为你更新体重为${newWeight}kg。`;
+
+    if (currentWeight && currentWeight !== newWeight) {
+      const diff = newWeight - currentWeight;
+      const diffText = diff > 0 ? `增加了${diff.toFixed(1)}kg` : `减少了${Math.abs(diff).toFixed(1)}kg`;
+      notice += `相比之前的${currentWeight}kg，你${diffText}。`;
+    }
+
+    // 添加历史对比信息
+    if (history.length > 0) {
+      const recentWeights = history.slice(0, 3);
+      if (recentWeights.length > 1) {
+        const trend = this.analyzeWeightTrend(recentWeights, newWeight);
+        notice += trend;
+      }
+    }
+
+    return notice;
+  }
+
+  /**
+   * 分析体重趋势
+   */
+  private analyzeWeightTrend(
+    recentWeights: Array<{ weight: number; createdAt: Date }>,
+    newWeight: number
+  ): string {
+    if (recentWeights.length < 2) return '';
+
+    const weights = [newWeight, ...recentWeights.map(w => w.weight)];
+    let trend = '';
+
+    // 计算最近几次的平均变化
+    let totalChange = 0;
+    for (let i = 0; i < weights.length - 1; i++) {
+      totalChange += weights[i] - weights[i + 1];
+    }
+    const avgChange = totalChange / (weights.length - 1);
+
+    if (Math.abs(avgChange) < 0.5) {
+      trend = '你的体重保持相对稳定，继续保持良好的生活习惯！';
+    } else if (avgChange > 0) {
+      trend = `最近体重呈上升趋势，建议加强运动和注意饮食控制。`;
+    } else {
+      trend = `最近体重呈下降趋势，很棒的进步！继续坚持健康的生活方式。`;
+    }
+
+    return trend;
+  }
+
+  /**
+   * 处理体重记录和更新（无图片版本）
+   * 从用户文本中识别体重，更新记录，并返回相关信息
+   */
+  async processWeightFromText(userId: string, userText?: string): Promise<{
+    weightKg?: number;
+    systemNotice?: string;
+    shouldSkipChat?: boolean;
+  }> {
+    if (!userText) return {};
+
+    // 检查是否是体重记录意图
+    if (!this.isLikelyWeightLogIntent(userText)) {
+      return {};
+    }
+
+    try {
+      // 从文本中提取体重
+      const extractedWeight = this.extractWeightFromText(userText);
+      if (!extractedWeight) {
+        return {};
+      }
+
+      // 获取用户体重历史
+      const { currentWeight, history } = await this.getUserWeightHistory(userId);
+
+      // 更新体重到数据库
+      await this.usersService.addWeightByVision(userId, extractedWeight);
+
+      // 构建系统提示
+      const systemNotice = this.buildWeightUpdateSystemNotice(
+        extractedWeight,
+        currentWeight || undefined,
+        history
+      );
+
+      return {
+        weightKg: extractedWeight,
+        systemNotice,
+        shouldSkipChat: false // 仍然需要与AI聊天，让AI给出激励回复
+      };
+
+    } catch (error) {
+      this.logger.error(`处理文本体重记录失败: ${error instanceof Error ? error.message : String(error)}`);
+      return {};
+    }
+  }
 }