feat: 统一智能体路由 + 删除 onboarding

- 新增 Unified 智能体（合并 health/diet/medication/exercise/default 全部工具）
- AI 自动判断意图并调用对应工具，前端胶囊自动切换
- 删除 onboarding 智能体及所有建档引导 UI
- 前端始终发 unified 类型，通过 tool_result 事件同步胶囊状态

health_app/lib/providers/chat_provider.dart

@@ -5,7 +5,7 @@ import 'auth_provider.dart';
 import 'data_providers.dart';
 import '../utils/sse_handler.dart';
 
-enum MessageType { text, dataConfirm, medicationConfirm, dietAnalysis, reportAnalysis, quickOptions, agentWelcome, taskCard, onboarding }
+enum MessageType { text, dataConfirm, medicationConfirm, dietAnalysis, reportAnalysis, quickOptions, agentWelcome, taskCard }
 
 class ChatMessage {
   final String id;
@@ -27,7 +27,7 @@ class ChatMessage {
   bool get isUser => role == 'user';
 }
 
-enum ActiveAgent { default_, consultation, health, diet, medication, report, exercise, onboarding }
+enum ActiveAgent { default_, consultation, health, diet, medication, report, exercise }
 
 class ChatState {
   final ActiveAgent activeAgent;
@@ -122,49 +122,10 @@ class ChatNotifier extends Notifier<ChatState> {
   ChatState build() {
     Future.microtask(() {
       insertTaskCard();
-      _checkOnboarding();
     });
     return const ChatState();
   }
 
-  void _checkOnboarding() async {
-    try {
-      final api = ref.read(apiClientProvider);
-      final res = await api.get('/api/user/health-archive');
-      final archive = res.data['data'];
-      // 档案全空 → 触发建档引导
-      final isEmpty = archive == null ||
-          (archive['diagnosis'] == null && archive['surgeryType'] == null &&
-           (archive['allergies'] == null || (archive['allergies'] as List).isEmpty) &&
-           (archive['chronicDiseases'] == null || (archive['chronicDiseases'] as List).isEmpty) &&
-           (archive['dietRestrictions'] == null || (archive['dietRestrictions'] as List).isEmpty));
-      if (isEmpty && !state.messages.any((m) => m.type == MessageType.onboarding)) {
-        final db = ref.read(localDbProvider);
-        final skipped = await db.read('onboarding_skipped');
-        if (skipped == null) {
-          state = state.copyWith(messages: [
-            ...state.messages,
-            ChatMessage(id: 'onboarding_card', role: 'assistant', content: '', createdAt: DateTime.now(), type: MessageType.onboarding),
-          ]);
-        }
-      }
-    } catch (_) {}
-  }
-
-  void startOnboarding() {
-    setAgent(ActiveAgent.onboarding);
-    // Remove onboarding card
-    state = state.copyWith(messages: state.messages.where((m) => m.type != MessageType.onboarding).toList());
-    // Send trigger message
-    Future.microtask(() => _sendToAI('开始建档'));
-  }
-
-  void dismissOnboarding() async {
-    final db = ref.read(localDbProvider);
-    await db.write('onboarding_skipped', DateTime.now().toIso8601String());
-    state = state.copyWith(messages: state.messages.where((m) => m.type != MessageType.onboarding).toList());
-  }
-
   void insertTaskCard() {
     if (state.messages.any((m) => m.type == MessageType.taskCard)) return;
     state = state.copyWith(messages: [ChatMessage(
@@ -179,6 +140,37 @@ class ChatNotifier extends Notifier<ChatState> {
   void setAgent(ActiveAgent a) {
     _subscription?.cancel();
     state = state.copyWith(activeAgent: a);
+    ref.read(selectedAgentProvider.notifier).select(a);
+  }
+
+  /// 根据 AI 调用的工具自动切换智能体胶囊
+  void _switchAgentByTool(String tool) {
+    ActiveAgent? agent;
+    switch (tool) {
+      case 'record_health_data':
+      case 'query_health_records':
+        agent = ActiveAgent.health;
+        break;
+      case 'estimate_food_text':
+        agent = ActiveAgent.diet;
+        break;
+      case 'manage_medication':
+        agent = ActiveAgent.medication;
+        break;
+      case 'manage_exercise':
+        agent = ActiveAgent.exercise;
+        break;
+      case 'request_doctor':
+        agent = ActiveAgent.consultation;
+        break;
+      case 'analyze_report':
+        agent = ActiveAgent.report;
+        break;
+    }
+    if (agent != null) {
+      ref.read(selectedAgentProvider.notifier).select(agent);
+      state = state.copyWith(activeAgent: agent);
+    }
   }
 
   Future<void> loadConversation(String convId) async {
@@ -298,10 +290,9 @@ class ChatNotifier extends Notifier<ChatState> {
         return;
       }
 
-      final agentPath =
-          state.activeAgent.name.replaceFirst('default_', 'default');
+      // 始终用 unified 智能体，AI 自动判断意图分配工具
       final stream = SseHandler.connect(
-        agentType: agentPath,
+        agentType: 'unified',
         message: text,
         conversationId: state.conversationId,
         token: token,
@@ -346,6 +337,8 @@ class ChatNotifier extends Notifier<ChatState> {
         state = state.copyWith(thinkingText: j['message'] as String?);
       case 'tool_result':
         final tool = j['tool'] as String? ?? '';
+        // 根据 AI 调用的工具自动切换智能体胶囊
+        _switchAgentByTool(tool);
         if (tool == 'record_health_data') {
           ref.invalidate(latestHealthProvider);
         }