fix: 健康档案保存按钮移至右上角 + 5页面补充返回按钮 + API地址修复

- 健康档案: 保存按钮移到AppBar右侧，删除底部按钮和绿色成功SnackBar
- 5个缺失页面补充左上角返回按钮: 健康概览/编辑用药/报告管理/报告详情/报告解读
- api_client.dart: 默认baseUrl改为192.168.1.29 (支持WiFi直连)

health_app/lib/pages/report/report_pages.dart

@@ -351,7 +351,10 @@ class ReportListPage extends ConsumerWidget {
 
     if (state.isAnalyzing) {
       return GradientScaffold(
-        appBar: AppBar(title: const Text('报告管理')),
+        appBar: AppBar(
+          leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => popRoute(ref)),
+          title: const Text('报告管理'),
+        ),
         body: Center(
           child: Column(
             mainAxisSize: MainAxisSize.min,
@@ -720,7 +723,10 @@ class ReportOriginalPage extends StatelessWidget {
   Widget build(BuildContext context) {
     final imageUrl = _absoluteUrl(url);
     return GradientScaffold(
-      appBar: AppBar(title: Text(title)),
+      appBar: AppBar(
+        leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+        title: Text(title),
+      ),
       body: Center(
         child: InteractiveViewer(
           minScale: 0.7,