refactor: 4层架构重构 + 饮食VLM接入 + 多项修复

- 后端: remaining_endpoints拆分为6个独立文件
- 后端: AI Agent Handler从ai_chat_endpoints抽取为7个独立处理器
- 后端: 食物识别prompt改为输出结构化JSON
- 前端: 饮食识别从Mock替换为真实VLM API调用
- 前端: 首页图片上传URL修复(/api/upload→/api/files/upload)
- 前端: 拍饮食按钮导航到独立DietCapturePage
- 前端: 删除无用agent_bar.dart
- 前端: 修复widget_test.dart过期属性名
- 前端: 恢复ServicePackageCard和详情页
- 新增6份实施文档(情况/问诊/报告/建档/日历/视觉统一)

health_app/lib/pages/diet/diet_capture_page.dart

@@ -1,8 +1,11 @@
+import 'dart:convert';
 import 'dart:io';
+import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:image_picker/image_picker.dart';
 import '../../core/navigation_provider.dart';
+import '../../providers/auth_provider.dart';
 
 final dietProvider = NotifierProvider<DietNotifier, DietState>(DietNotifier.new);
 
@@ -41,12 +44,14 @@ class DietState {
 class FoodItem {
   final String id;
   String name;
+  String portion;
   int calories;
   bool selected;
 
   FoodItem({
     required this.id,
     required this.name,
+    required this.portion,
     required this.calories,
     this.selected = true,
   });
@@ -60,36 +65,94 @@ class DietNotifier extends Notifier<DietState> {
     state = state.copyWith(imagePath: path);
   }
 
-  void analyzeImage() async {
+  String? _analysisError;
+
+  Future<void> analyzeImage() async {
     state = state.copyWith(isAnalyzing: true);
-    await Future.delayed(const Duration(seconds: 2));
-    final mockFoods = [
-      FoodItem(id: '1', name: '米饭', calories: 150),
-      FoodItem(id: '2', name: '番茄炒蛋', calories: 200),
-      FoodItem(id: '3', name: '红烧肉', calories: 350),
-      FoodItem(id: '4', name: '青菜', calories: 50),
-    ];
-    state = state.copyWith(foods: mockFoods, isAnalyzing: false, healthScore: 3);
+    _analysisError = null;
+    try {
+      final api = ref.read(apiClientProvider);
+      final imageFile = File(state.imagePath!);
+
+      final formData = FormData.fromMap({
+        'images': await MultipartFile.fromFile(
+          imageFile.path,
+          filename: imageFile.path.split('/').last,
+        ),
+      });
+      final res = await api.dio.post('/api/ai/analyze-food-image', data: formData);
+      final data = res.data;
+      if (data['code'] != 0) {
+        _analysisError = data['message'] ?? '识别失败';
+        state = state.copyWith(isAnalyzing: false);
+        return;
+      }
+
+      final raw = data['data'] as String? ?? '[]';
+      final foods = _parseFoodItems(raw);
+      state = state.copyWith(
+        foods: foods,
+        isAnalyzing: false,
+        healthScore: foods.isNotEmpty ? 3 : null,
+      );
+    } catch (e) {
+      _analysisError = '识别失败: $e';
+      state = state.copyWith(isAnalyzing: false);
+    }
+  }
+
+  List<FoodItem> _parseFoodItems(String raw) {
+    var json = raw.trim();
+    if (json.startsWith('```')) {
+      final start = json.indexOf('\n');
+      if (start != -1) json = json.substring(start + 1);
+      final end = json.lastIndexOf('```');
+      if (end != -1) json = json.substring(0, end);
+      json = json.trim();
+    }
+    try {
+      final list = jsonDecode(json) as List;
+      return list.asMap().entries.map((e) {
+        final item = e.value as Map<String, dynamic>;
+        return FoodItem(
+          id: 'food_${DateTime.now().millisecondsSinceEpoch}_${e.key}',
+          name: item['name']?.toString() ?? '未知食物',
+          portion: item['portion']?.toString() ?? '',
+          calories: (item['calories'] as num?)?.toInt() ?? 0,
+          selected: true,
+        );
+      }).toList();
+    } catch (_) {
+      return [
+        FoodItem(
+          id: 'food_${DateTime.now().millisecondsSinceEpoch}',
+          name: '识别结果（手动编辑）',
+          portion: raw.length > 50 ? raw.substring(0, 50) : raw,
+          calories: 0,
+          selected: true,
+        ),
+      ];
+    }
   }
 
   void updateFoodName(String id, String name) {
-    final foods = state.foods.map((f) => f.id == id ? FoodItem(id: f.id, name: name, calories: f.calories, selected: f.selected) : f).toList();
+    final foods = state.foods.map((f) => f.id == id ? FoodItem(id: f.id, name: name, portion: f.portion, calories: f.calories, selected: f.selected) : f).toList();
     state = state.copyWith(foods: foods);
   }
 
   void updateFoodCalories(String id, int calories) {
-    final foods = state.foods.map((f) => f.id == id ? FoodItem(id: f.id, name: f.name, calories: calories, selected: f.selected) : f).toList();
+    final foods = state.foods.map((f) => f.id == id ? FoodItem(id: f.id, name: f.name, portion: f.portion, calories: calories, selected: f.selected) : f).toList();
     state = state.copyWith(foods: foods);
   }
 
   void toggleFood(String id) {
-    final foods = state.foods.map((f) => f.id == id ? FoodItem(id: f.id, name: f.name, calories: f.calories, selected: !f.selected) : f).toList();
+    final foods = state.foods.map((f) => f.id == id ? FoodItem(id: f.id, name: f.name, portion: f.portion, calories: f.calories, selected: !f.selected) : f).toList();
     state = state.copyWith(foods: foods);
   }
 
   void addFood() {
     final newId = '${DateTime.now().millisecondsSinceEpoch}';
-    final foods = [...state.foods, FoodItem(id: newId, name: '新食物', calories: 100)];
+    final foods = [...state.foods, FoodItem(id: newId, name: '新食物', portion: '', calories: 100)];
     state = state.copyWith(foods: foods);
   }
 
@@ -330,6 +393,8 @@ class DietCapturePage extends ConsumerWidget {
               onChanged: (v) => ref.read(dietProvider.notifier).updateFoodName(food.id, v),
               style: const TextStyle(fontSize: 16),
             ),
+            if (food.portion.isNotEmpty)
+              Text(food.portion, style: const TextStyle(fontSize: 12, color: Color(0xFF999999))),
             Row(children: [
               const Text('热量：', style: TextStyle(fontSize: 12, color: Color(0xFF999999))),
               SizedBox(