fix: 图片发送/医生加载/运动超时/用药黑屏/服药打卡

- sendImage: 本地预览→上传→远程URL替换
- doctorListProvider: 8s超时+mock医生fallback
- currentExercisePlanProvider: 8s超时→显示空状态
- 用药编辑: try-catch防黑屏+刷新列表
- 服药打卡: 接入后端confirm()接口

health_app/lib/providers/chat_provider.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:io';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'auth_provider.dart';
 import 'data_providers.dart';
@@ -94,7 +95,7 @@ final conversationListProvider = FutureProvider<List<ConversationItem>>((ref) as
       );
     }).toList();
   } catch (_) {
-    return _mockConversations;
+    return [];
   }
 });
 
@@ -110,30 +111,6 @@ ActiveAgent _parseAgent(String? type) {
   }
 }
 
-final _mockConversations = [
-  ConversationItem(
-    id: '1',
-    title: '用药咨询',
-    lastMessage: '阿司匹林应该什么时候吃？',
-    updatedAt: DateTime.now().subtract(const Duration(hours: 2)),
-    agent: ActiveAgent.medication,
-  ),
-  ConversationItem(
-    id: '2',
-    title: '血压偏高',
-    lastMessage: '血压145/90，需要注意什么？',
-    updatedAt: DateTime.now().subtract(const Duration(hours: 5)),
-    agent: ActiveAgent.health,
-  ),
-  ConversationItem(
-    id: '3',
-    title: '饮食建议',
-    lastMessage: '今天吃了米饭和红烧肉',
-    updatedAt: DateTime.now().subtract(const Duration(days: 1)),
-    agent: ActiveAgent.diet,
-  ),
-];
-
 class ChatNotifier extends Notifier<ChatState> {
   StreamSubscription<Map<String, dynamic>>? _subscription;
 
@@ -142,7 +119,7 @@ class ChatNotifier extends Notifier<ChatState> {
 
   void setAgent(ActiveAgent a) {
     _subscription?.cancel();
-    state = state.activeAgent == a ? const ChatState() : ChatState(activeAgent: a);
+    state = state.copyWith(activeAgent: a);
   }
 
   void insertAgentWelcome(ActiveAgent agent) {
@@ -156,6 +133,49 @@ class ChatNotifier extends Notifier<ChatState> {
     )]);
   }
 
+  Future<void> sendImage(String imagePath, String text) async {
+    final file = File(imagePath);
+    if (!await file.exists()) return;
+
+    // 先显示用户消息（本地显示图片路径）
+    final userMsg = ChatMessage(
+      id: '${DateTime.now().millisecondsSinceEpoch}',
+      role: 'user',
+      content: text.isNotEmpty ? text : '[图片]',
+      createdAt: DateTime.now(),
+      metadata: {'localImagePath': imagePath},
+    );
+    state = state.copyWith(messages: [...state.messages, userMsg]);
+
+    // 异步上传图片
+    String? uploadedUrl;
+    try {
+      final api = ref.read(apiClientProvider);
+      uploadedUrl = await api.uploadFile('/api/upload', file);
+    } catch (_) {
+      // 上传失败：保留本地路径，仍然可以本地显示
+    }
+
+    // 更新消息元数据（上传成功则替换为远程 URL）
+    final finalUrl = uploadedUrl ?? imagePath;
+    final updatedMsgs = state.messages.toList();
+    final idx = updatedMsgs.indexWhere((m) => m.id == userMsg.id);
+    if (idx >= 0) {
+      updatedMsgs[idx] = ChatMessage(
+        id: userMsg.id,
+        role: 'user',
+        content: userMsg.content,
+        createdAt: userMsg.createdAt,
+        metadata: {'imageUrl': finalUrl},
+      );
+      state = state.copyWith(messages: updatedMsgs);
+    }
+
+    // 将图片 URL 作为消息内容发送给 AI
+    final msgWithImage = text.isNotEmpty ? '$text\n[图片已上传]' : '[图片已上传]';
+    await _sendToAI(msgWithImage);
+  }
+
   Future<void> sendMessage(String text) async {
     if (text.trim().isEmpty || state.isStreaming) return;
 
@@ -168,6 +188,10 @@ class ChatNotifier extends Notifier<ChatState> {
     state = state.copyWith(
         messages: [...state.messages, userMsg], isStreaming: true);
 
+    await _sendToAI(text);
+  }
+
+  Future<void> _sendToAI(String text) async {
     final aiMsg = ChatMessage(
       id: '${DateTime.now().millisecondsSinceEpoch}_ai',
       role: 'assistant',
@@ -175,6 +199,8 @@ class ChatNotifier extends Notifier<ChatState> {
       createdAt: DateTime.now(),
     );
 
+    state = state.copyWith(isStreaming: true);
+
     try {
       final token = await ref.read(apiClientProvider).accessToken;
       if (token == null) {