feat(nutrition): 添加营养成分表拍照分析功能

新增营养成分表拍照识别功能，用户可通过拍摄食物包装上的成分表自动解析营养信息：
- 创建成分表分析页面，支持拍照/选择图片和结果展示
- 集成新的营养成分分析API，支持图片上传和流式分析
- 在营养雷达卡片中添加成分表分析入口
- 更新应用版本至1.0.19

services/nutritionLabelAnalysis.ts

@@ -0,0 +1,174 @@
+import { api, postTextStream, type TextStreamCallbacks } from '@/services/api';
+import type { CreateDietRecordDto, MealType } from './dietRecords';
+
+export interface NutritionLabelData {
+  energy: number; // 能量 (kJ/千卡)
+  protein: number; // 蛋白质 (g)
+  fat: number; // 脂肪 (g)
+  carbohydrate: number; // 碳水化合物 (g)
+  sodium: number; // 钠 (mg)
+  fiber?: number; // 膳食纤维 (g)
+  sugar?: number; // 糖 (g)
+  servingSize?: string; // 每份量
+}
+
+export interface NutritionLabelAnalysisResult {
+  id: string;
+  imageUri: string;
+  nutritionData: NutritionLabelData;
+  confidence: number;
+  analyzedAt: string;
+  foodName?: string; // 识别出的食物名称
+  brand?: string; // 品牌
+}
+
+export interface NutritionLabelAnalysisRequest {
+  imageUri: string;
+}
+
+// 新API返回的营养成分项
+export interface NutritionItem {
+  key: string;
+  name: string;
+  value: string;
+  analysis: string;
+}
+
+// 新API返回的响应格式
+export interface NutritionAnalysisResponse {
+  success: boolean;
+  data: NutritionItem[];
+  message?: string; // 仅在失败时返回
+}
+
+// 新API请求参数
+export interface NutritionAnalysisRequest {
+  imageUrl: string;
+}
+
+/**
+ * 分析营养成分表（非流式）
+ */
+export async function analyzeNutritionLabel(request: NutritionLabelAnalysisRequest): Promise<NutritionLabelAnalysisResult> {
+  return api.post<NutritionLabelAnalysisResult>('/ai-coach/nutrition-label-analysis', request);
+}
+
+/**
+ * 流式分析营养成分表
+ */
+export async function analyzeNutritionLabelStream(
+  request: NutritionLabelAnalysisRequest,
+  callbacks: TextStreamCallbacks
+) {
+  const body = {
+    imageUri: request.imageUri,
+    stream: true
+  };
+
+  return postTextStream('/ai-coach/nutrition-label-analysis', body, callbacks, { timeoutMs: 120000 });
+}
+
+/**
+ * 保存成分表分析结果到饮食记录
+ */
+export async function saveNutritionLabelToDietRecord(
+  analysisResult: NutritionLabelAnalysisResult,
+  mealType: MealType
+): Promise<any> {
+  const dietRecordData: CreateDietRecordDto = {
+    mealType,
+    foodName: analysisResult.foodName || '成分表分析食物',
+    foodDescription: `品牌: ${analysisResult.brand || '未知'}`,
+    portionDescription: analysisResult.nutritionData.servingSize || '100g',
+    estimatedCalories: analysisResult.nutritionData.energy,
+    proteinGrams: analysisResult.nutritionData.protein,
+    carbohydrateGrams: analysisResult.nutritionData.carbohydrate,
+    fatGrams: analysisResult.nutritionData.fat,
+    fiberGrams: analysisResult.nutritionData.fiber,
+    sugarGrams: analysisResult.nutritionData.sugar,
+    sodiumMg: analysisResult.nutritionData.sodium,
+    source: 'vision',
+    mealTime: new Date().toISOString(),
+    imageUrl: analysisResult.imageUri,
+    aiAnalysisResult: analysisResult,
+  };
+
+  return api.post('/diet-records', dietRecordData);
+}
+
+/**
+ * 分析营养成分表图片（新API）
+ * 需要先上传图片到COS获取URL，然后调用此接口
+ */
+export async function analyzeNutritionImage(request: NutritionAnalysisRequest): Promise<NutritionAnalysisResponse> {
+  return api.post<NutritionAnalysisResponse>('/diet-records/analyze-nutrition-image', request);
+}
+
+/**
+ * 将新API的分析结果转换为旧格式，以便与现有UI兼容
+ */
+export function convertNewApiResultToOldFormat(
+  newResult: NutritionAnalysisResponse,
+  imageUri: string
+): NutritionLabelAnalysisResult | null {
+  if (!newResult.success || !newResult.data || newResult.data.length === 0) {
+    return null;
+  }
+
+  // 从新API结果中提取营养数据
+  const nutritionData: NutritionLabelData = {
+    energy: 0,
+    protein: 0,
+    fat: 0,
+    carbohydrate: 0,
+    sodium: 0,
+    fiber: 0,
+    sugar: 0,
+  };
+
+  // 查找各个营养素的值并转换为数字
+  newResult.data.forEach(item => {
+    const valueStr = item.value;
+    // 提取数字部分
+    const numericValue = parseFloat(valueStr.replace(/[^\d.]/g, ''));
+
+    switch (item.key) {
+      case 'energy_kcal':
+        // 如果是千焦，转换为千卡 (1千焦 ≈ 0.239千卡)
+        if (valueStr.includes('千焦')) {
+          nutritionData.energy = Math.round(numericValue * 0.239);
+        } else {
+          nutritionData.energy = numericValue;
+        }
+        break;
+      case 'protein':
+        nutritionData.protein = numericValue;
+        break;
+      case 'fat':
+        nutritionData.fat = numericValue;
+        break;
+      case 'carbohydrate':
+        nutritionData.carbohydrate = numericValue;
+        break;
+      case 'sodium':
+        nutritionData.sodium = numericValue;
+        break;
+      case 'fiber':
+        nutritionData.fiber = numericValue;
+        break;
+      case 'sugar':
+        nutritionData.sugar = numericValue;
+        break;
+    }
+  });
+
+  return {
+    id: Date.now().toString(),
+    imageUri,
+    nutritionData,
+    confidence: 0.9, // 新API没有提供置信度，使用默认值
+    analyzedAt: new Date().toISOString(),
+    foodName: '营养成分表分析',
+    brand: '未知',
+  };
+}