feat: AI 对话附件上下文解析 + 历史会话归档 + 多页面 UI 重构

- 后端: 新增 AttachmentContextBuilder 解析图片/PDF 摘要并拼入 LLM 上下文; ai_chat_endpoints 扩展附件接口; 新增 ReportAnalysisService
- 前端: 新增历史会话页与 conversation_history_provider; chat 链路支持附件展示与回放
- UI: 重构 medication_checkin / notification_center / profile / health_drawer 等多页面
- 配置: api_client baseUrl 适配当前 WiFi IP

health_app/lib/pages/medication/medication_edit_page.dart

@@ -139,7 +139,10 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
   Widget build(BuildContext context) {
     return GradientScaffold(
       appBar: AppBar(
-        leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => popRoute(ref)),
+        leading: IconButton(
+          icon: const Icon(Icons.arrow_back),
+          onPressed: () => popRoute(ref),
+        ),
         title: Text(widget.id != null ? '编辑用药' : '添加用药'),
       ),
       body: ListView(
@@ -164,7 +167,13 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
           _label('每日服药次数'), const SizedBox(height: 8),
           GestureDetector(
             onTap: () async {
-              final n = await showAppCountPicker(context, initialValue: _timesPerDay, min: 1, max: 4, label: ' 次');
+              final n = await showAppCountPicker(
+                context,
+                initialValue: _timesPerDay,
+                min: 1,
+                max: 4,
+                label: ' 次',
+              );
               if (n != null) _updateTimes(n);
             },
             child: Container(
@@ -333,7 +342,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
                 border: Border.all(color: AppColors.border),
               ),
               child: Text(
-                '${val.year} ${val.month.toString().padLeft(2, '0')} ${val.day.toString().padLeft(2, '0')}',
+                _displayDate(val),
                 style: const TextStyle(fontSize: 18),
               ),
             ),
@@ -370,7 +379,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
           child: Row(
             children: [
               Text(
-                val != null ? '${val.year} ${val.month.toString().padLeft(2, '0')} ${val.day.toString().padLeft(2, '0')}' : '不设置',
+                val != null ? _displayDate(val) : '不设置',
                 style: TextStyle(
                   fontSize: 18,
                   color: val != null ? null : AppTheme.textHint,
@@ -393,3 +402,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
     ],
   );
 }
+
+String _displayDate(DateTime date) {
+  return '${date.year}/${date.month.toString().padLeft(2, '0')}/${date.day.toString().padLeft(2, '0')}';
+}