feat(diet-records): 修复营养成分分析记录查询参数验证和类型转换

修复GET请求查询参数验证装饰器缺失问题，添加正确的class-validator装饰器
在控制器中实现查询参数类型转换，确保数字参数正确处理
更新技术文档，添加DTO验证装饰器编写规范和GET请求参数处理指南

src/diet-records/diet-records.controller.ts

@@ -227,7 +227,16 @@ export class DietRecordsController {
     this.logger.log(`获取营养成分分析记录 - 用户ID: ${user.sub}`);
 
     try {
-      const result = await this.nutritionAnalysisService.getAnalysisRecords(user.sub, query);
+      // 转换查询参数中的字符串为数字
+      const convertedQuery = {
+        page: query.page ? parseInt(query.page, 10) : undefined,
+        limit: query.limit ? parseInt(query.limit, 10) : undefined,
+        startDate: query.startDate,
+        endDate: query.endDate,
+        status: query.status,
+      };
+
+      const result = await this.nutritionAnalysisService.getAnalysisRecords(user.sub, convertedQuery);
 
       // 转换为DTO格式
       const recordDtos: NutritionAnalysisRecordDto[] = result.records.map(record => ({