fix: VLM 参数优化 - temperature 0.7, top_p 0.8, 指令放 system+user

- VisionAsync 新增 Temperature=0.7, TopP=0.8
- system prompt 用专业营养识别指令
- userText 用简短"请看图识别食物"配合图片
- 修复重复 prompt 导致 VLM 误读文本的 bug

health_app/lib/pages/report/ai_analysis_page.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+class AiAnalysisPage extends ConsumerWidget {
+  const AiAnalysisPage({super.key});
+
+  @override Widget build(BuildContext context, WidgetRef ref) {
+    return Scaffold(
+      backgroundColor: Colors.white,
+      appBar: AppBar(backgroundColor: Colors.white, elevation: 0, leading: IconButton(icon: const Icon(Icons.chevron_left), onPressed: () => Navigator.pop(context)), title: _buildTitle(), centerTitle: true, actions: [IconButton(icon: const Icon(Icons.more_vert), color: const Color(0xFF666666), onPressed: () {})]),
+      body: SingleChildScrollView(padding: const EdgeInsets.all(16), child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [_buildReportPreview(), const SizedBox(height: 20), _buildIndicators(), const SizedBox(height: 24), _buildAiInterpretation(), const SizedBox(height: 24), _buildDoctorAdvice(), const SizedBox(height: 24), _buildHealthTips()])),
+    );
+  }
+
+  Widget _buildTitle() {
+    return Row(mainAxisSize: MainAxisSize.min, children: [
+      Container(padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4), decoration: BoxDecoration(color: const Color(0xFF635BFF).withAlpha(15), borderRadius: BorderRadius.circular(12)), child: Row(mainAxisSize: MainAxisSize.min, children: [const Icon(Icons.auto_awesome, size: 16, color: Color(0xFF635BFF)), const SizedBox(width: 4), const Text('AI预解读', style: TextStyle(fontSize: 13, color: Color(0xFF635BFF), fontWeight: FontWeight.w500))])),
+      const SizedBox(width: 4), Text('血常规检查', style: TextStyle(color: Colors.grey[800], fontWeight: FontWeight.w600)),
+    ]);
+  }
+
+  Widget _buildReportPreview() => Container(width: double.infinity, height: 180, decoration: BoxDecoration(color: const Color(0xFFF5F3FF), borderRadius: BorderRadius.circular(16), border: Border.all(color: const Color(0xFFE8E6FF), width: 1.5)), child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [Icon(Icons.description_outlined, size: 48, color: Colors.grey[400]), const SizedBox(height: 8), Text('检查报告图片', style: TextStyle(fontSize: 14, color: Colors.grey[600]))]));
+
+  Widget _buildIndicators() {
+    final indicators = [{'name': '红细胞 (RBC)', 'value': '4.68', 'unit': '(×10¹²/L)', 'ref': '4.0-5.50', 'status': 'normal'}, {'name': '白细胞 (WBC)', 'value': '6.55', 'unit': '(×10⁹/L)', 'ref': '3.5-9.50', 'status': 'normal'}, {'name': '血红蛋白 (HGB)', 'value': '135', 'unit': '(g/L)', 'ref': '120-175', 'status': 'normal'}, {'name': '血小板 (PLT)', 'value': '235', 'unit': '(×10⁹/L)', 'ref': '125-350', 'status': 'normal'}];
+    return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [const Text('指标详情', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))), const SizedBox(height: 12), ...indicators.map((item) => _indicatorCard(item)).toList()]);
+  }
+
+  Widget _indicatorCard(Map<String, dynamic> item) {
+    final isNormal = item['status'] == 'normal';
+    return Container(margin: const EdgeInsets.only(bottom: 10), padding: const EdgeInsets.all(14), decoration: BoxDecoration(color: isNormal ? const Color(0xFFF8FDFB) : const Color(0xFFFFF8F5), borderRadius: BorderRadius.circular(14), border: Border.all(color: isNormal ? const Color(0xFFD4EDDA) : const Color(0xFFFFD7C5))), child: Row(children: [Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [Text(item['name']?.toString() ?? '', style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w500, color: Color(0xFF333333))), const SizedBox(height: 4), Text('参考范围：${item['ref']?.toString() ?? ''}', style: TextStyle(fontSize: 12, color: Colors.grey[500]))])), Column(crossAxisAlignment: CrossAxisAlignment.end, children: [Text('${item['value']?.toString() ?? ''} ${item['unit']?.toString() ?? ''}', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: Color(0xFF1A1A1A))), const SizedBox(height: 2), Container(padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2), decoration: BoxDecoration(color: isNormal ? const Color(0xFF43A047).withAlpha(20) : const Color(0xFFFF9800).withAlpha(20), borderRadius: BorderRadius.circular(8)), child: Text(isNormal ? '正常' : '偏高', style: TextStyle(fontSize: 11, color: isNormal ? const Color(0xFF43A047) : const Color(0xFFFF9800))))])]));
+  }
+
+  Widget _buildAiInterpretation() => Container(width: double.infinity, padding: const EdgeInsets.all(16), decoration: BoxDecoration(color: const Color(0xFFF5F3FF), borderRadius: BorderRadius.circular(16)), child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [Row(children: [Icon(Icons.auto_awesome, size: 18, color: const Color(0xFF635BFF)), const SizedBox(width: 6), const Text('AI 智能解读', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))), const Spacer(), Container(padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3), decoration: BoxDecoration(color: const Color(0xFF635BFF).withAlpha(15), borderRadius: BorderRadius.circular(10)), child: const Text('已分析', style: TextStyle(fontSize: 11, color: Color(0xFF635BFF))))]), const SizedBox(height: 12), const Text('您的血常规检查结果基本正常，各项指标均在参考范围内。红细胞、白细胞、血小板计数均处于健康水平，血红蛋白含量充足，说明您的造血功能和免疫功能良好。建议继续保持良好的生活习惯，定期复查。', style: TextStyle(fontSize: 14, height: 1.6, color: const Color(0xFF444444)))]));
+
+  Widget _buildDoctorAdvice() => Column(crossAxisAlignment: CrossAxisAlignment.start, children: [Row(children: [CircleAvatar(radius: 16, backgroundColor: const Color(0xFFEDEBFF), child: const Icon(Icons.local_hospital, size: 16, color: Color(0xFF635BFF))), const SizedBox(width: 8), const Text('医生建议', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A)))]), const SizedBox(height: 12), Container(width: double.infinity, padding: const EdgeInsets.all(14), decoration: BoxDecoration(borderRadius: BorderRadius.circular(14), border: Border.all(color: const Color(0xFFEEEEEE))), child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [_adviceItem('李医生', '心内科', '各项指标正常，继续保持。注意低盐饮食，适当运动。'), const Divider(), _adviceItem('王医生', '全科', '血常规结果理想，无需特殊处理。下次体检可关注血脂指标.')]))]);
+
+  Widget _adviceItem(String name, String dept, String advice) => Padding(padding: const EdgeInsets.symmetric(vertical: 8), child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: [CircleAvatar(radius: 14, backgroundColor: const Color(0xFFF5F3FF), child: Text(name[0], style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: Color(0xFF635BFF)))), const SizedBox(width: 10), Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [Row(children: [Text(name, style: const TextStyle(fontSize: 14, fontWeight: FontWeight.w500, color: Color(0xFF333333))), const SizedBox(width: 6), Text(dept, style: TextStyle(fontSize: 12, color: Colors.grey[500]))]), const SizedBox(height: 4), Text(advice, style: TextStyle(fontSize: 13, color: Colors.grey[700], height: 1.4))]))]));
+
+  Widget _buildHealthTips() => Column(crossAxisAlignment: CrossAxisAlignment.start, children: [Row(children: [Icon(Icons.lightbulb_outline, size: 18, color: const Color(0xFFFFB800)), const SizedBox(width: 8), const Text('健康提示', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A)))]), const SizedBox(height: 12), ...['定期进行血常规检查，建议每半年一次', '保持均衡饮食，多吃富含铁和维生素的食物', '适度运动，每周至少150分钟中等强度有氧运动', '保证充足睡眠，每晚7-8小时'].map((tip) => Padding(padding: const EdgeInsets.only(bottom: 8), child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: [Container(margin: const EdgeInsets.only(top: 6), width: 6, height: 6, decoration: const BoxDecoration(color: Color(0xFFFFB800), shape: BoxShape.circle)), const SizedBox(width: 10), Expanded(child: Text(tip, style: TextStyle(fontSize: 14, color: Colors.grey[700], height: 1.4)))]))).toList()]);
+}