feat: 后端架构重构 — Endpoint→Service→Repository分层 + AI确认机制 + 异步任务持久化

- 核心业务拆分为 Endpoint → Application Service → Repository 三层
- AI写入操作必须用户确认后才写库(确认卡片机制)
- 报告/饮食/用药分析改为持久化任务队列(原子领取/重试/重启恢复)
- 运动计划修复: 连续真实日期替代周模板
- 用药提醒去重 + 通知Outbox预留
- 认证收拢到AuthService, 管理员收拢到AdminService
- AI会话加用户归属校验防串号
- 提示词调整为患者视角
- 开发假数据已关闭
- 21/21测试通过, 0警告0错误

health_app/lib/providers/chat_provider.dart

@@ -79,64 +79,60 @@ final chatProvider = NotifierProvider<ChatNotifier, ChatState>(
   ChatNotifier.new,
 );
 
-ActiveAgent _parseAgent(String? type) {
-  switch (type?.toLowerCase()) {
-    case 'consultation':
-      return ActiveAgent.consultation;
-    case 'health':
-      return ActiveAgent.health;
-    case 'diet':
-      return ActiveAgent.diet;
-    case 'medication':
-      return ActiveAgent.medication;
-    case 'report':
-      return ActiveAgent.report;
-    case 'exercise':
-      return ActiveAgent.exercise;
-    default:
-      return ActiveAgent.default_;
-  }
-}
-
 class ChatNotifier extends Notifier<ChatState> {
   StreamSubscription<Map<String, dynamic>>? _subscription;
+  Completer<void>? _streamDone;
   ActiveAgent? _lastTriggeredAgent;
 
   void markNeedsRebuild() => state = state.copyWith();
 
   /// 不可变消息操作方法（供 chat_messages_view 新版代码调用）
-  void confirmMessage(String id) {
+  Future<String?> confirmMessage(String id) async {
     final msgs = state.messages.toList();
     final i = msgs.indexWhere((m) => m.id == id);
-    if (i >= 0) {
-      msgs[i].confirmed = true;
-      state = state.copyWith(messages: msgs);
+    if (i < 0) return '确认卡片不存在';
+
+    final rawIds = msgs[i].metadata?['confirmationIds'];
+    final confirmationIds = rawIds is List
+        ? rawIds.map((e) => e.toString()).where((e) => e.isNotEmpty).toList()
+        : <String>[];
+    if (confirmationIds.isEmpty) {
+      return '确认信息已失效，请重新发送需要录入的内容';
     }
+
+    try {
+      final api = ref.read(apiClientProvider);
+      for (final confirmationId in confirmationIds.toList()) {
+        final response = await api.post('/api/ai/confirm-write/$confirmationId');
+        final body = response.data;
+        if (body is! Map || body['code'] != 0) {
+          return body is Map ? body['message']?.toString() ?? '录入失败' : '录入失败';
+        }
+        confirmationIds.remove(confirmationId);
+        msgs[i].metadata?['confirmationIds'] = confirmationIds.toList();
+        state = state.copyWith(messages: msgs);
+      }
+    } catch (e) {
+      return '录入失败，请检查网络后重试';
+    }
+
+    msgs[i].confirmed = true;
+    state = state.copyWith(messages: msgs);
     ref.invalidate(medicationListProvider);
     ref.invalidate(latestHealthProvider);
-  }
-
-  void startEditingField(String msgId, String fieldLabel) {
-    final msgs = state.messages.toList();
-    final i = msgs.indexWhere((m) => m.id == msgId);
-    if (i >= 0) {
-      msgs[i].metadata?['_editingField'] = fieldLabel;
-      state = state.copyWith(messages: msgs);
-    }
-  }
-
-  void finishEditingField(String msgId, String fieldLabel, String value) {
-    final msgs = state.messages.toList();
-    final i = msgs.indexWhere((m) => m.id == msgId);
-    if (i >= 0) {
-      if (value.isNotEmpty) msgs[i].metadata?[fieldLabel] = value;
-      msgs[i].metadata?.remove('_editingField');
-      state = state.copyWith(messages: msgs);
-    }
+    return null;
   }
 
   @override
   ChatState build() {
+    ref.onDispose(() {
+      _subscription?.cancel();
+      _subscription = null;
+      if (_streamDone != null && !_streamDone!.isCompleted) {
+        _streamDone!.complete();
+      }
+      _streamDone = null;
+    });
     Future.microtask(() {
       insertTaskCard();
     });
@@ -162,7 +158,7 @@ class ChatNotifier extends Notifier<ChatState> {
   void setAgent(ActiveAgent a) {
     // 流式回复中忽略胶囊切换，防止状态混乱
     if (state.isStreaming) return;
-    _subscription?.cancel();
+    _cancelActiveStream();
     state = state.copyWith(activeAgent: a);
     ref.read(selectedAgentProvider.notifier).select(a);
   }
@@ -198,7 +194,7 @@ class ChatNotifier extends Notifier<ChatState> {
   }
 
   Future<void> loadConversation(String convId) async {
-    _subscription?.cancel();
+    await _cancelActiveStream();
     try {
       final api = ref.read(apiClientProvider);
       final res = await api.get('/api/ai/conversations/$convId');
@@ -277,11 +273,12 @@ class ChatNotifier extends Notifier<ChatState> {
 
     // 异步上传图片
     String? uploadedUrl;
+    Object? uploadError;
     try {
       final api = ref.read(apiClientProvider);
       uploadedUrl = await api.uploadFile('/api/files/upload', file);
-    } catch (_) {
-      // 上传失败：保留本地路径，仍然可以本地显示
+    } catch (e) {
+      uploadError = e;
     }
 
     // 更新消息元数据（保留本地路径 + 添加远程URL）
@@ -300,6 +297,17 @@ class ChatNotifier extends Notifier<ChatState> {
       state = state.copyWith(messages: updatedMsgs);
     }
 
+    if (uploadedUrl == null) {
+      final errorMsg = ChatMessage(
+        id: '${DateTime.now().millisecondsSinceEpoch}_upload_error',
+        role: 'assistant',
+        content: uploadError == null ? '图片上传失败，请稍后重试。' : '图片上传失败，请检查文件大小或网络后重试。',
+        createdAt: DateTime.now(),
+      );
+      state = state.copyWith(messages: [...state.messages, errorMsg]);
+      return;
+    }
+
     // 将图片 URL 作为消息内容发送给 AI
     final msgWithImage = text.isNotEmpty ? '$text\n[图片已上传]' : '[图片已上传]';
     await _sendToAI(msgWithImage);
@@ -352,9 +360,26 @@ class ChatNotifier extends Notifier<ChatState> {
         token: token,
       );
 
-      await for (final event in stream) {
-        _processEvent(event, aiMsg);
+      await _cancelActiveStream();
+      final done = Completer<void>();
+      _streamDone = done;
+      _subscription = stream.listen(
+        (event) => _processEvent(event, aiMsg),
+        onError: (_) {
+          _addError(aiMsg, '网络异常，请稍后重试');
+          if (!done.isCompleted) done.complete();
+        },
+        onDone: () {
+          if (!done.isCompleted) done.complete();
+        },
+        cancelOnError: true,
+      );
+      await done.future;
+      if (_streamDone == done) {
+        _streamDone = null;
+        _subscription = null;
       }
+
       if (state.isStreaming) {
         _done(aiMsg);
       }
@@ -363,6 +388,15 @@ class ChatNotifier extends Notifier<ChatState> {
     }
   }
 
+  Future<void> _cancelActiveStream() async {
+    await _subscription?.cancel();
+    _subscription = null;
+    if (_streamDone != null && !_streamDone!.isCompleted) {
+      _streamDone!.complete();
+    }
+    _streamDone = null;
+  }
+
   void _addError(ChatMessage aiMsg, String errorText) {
     aiMsg.content = errorText;
     aiMsg.type = MessageType.text;