feat: 添加 Analytics 分析功能（行为追踪、错误码、协议更新）

apps/lib/features/chat/presentation/bloc/chat_bloc_events.dart

@@ -6,6 +6,11 @@ extension _ChatBlocEvents on ChatBloc {
   void _handleEvent(AgUiEvent event) {
     switch (event.type) {
       case AgUiEventType.runStarted:
+        final runStartedEvent = event as RunStartedEvent;
+        _recordRunStarted(
+          runId: runStartedEvent.runId,
+          threadId: runStartedEvent.threadId,
+        );
         emit(
           state.copyWith(
             isSending: false,
@@ -17,11 +22,14 @@ extension _ChatBlocEvents on ChatBloc {
           ),
         );
       case AgUiEventType.runFinished:
+        _trackChatCompleted();
+        _clearRunMetrics();
         emit(
           _resetRunState().copyWith(items: _removeToolCallItems(state.items)),
         );
       case AgUiEventType.runError:
         final errorEvent = event as RunErrorEvent;
+        _clearRunMetrics();
         final isCanceledByUser = errorEvent.code == 'RUN_CANCELED';
         emit(
           _resetRunState(
@@ -72,6 +80,7 @@ extension _ChatBlocEvents on ChatBloc {
   }
 
   void _handleTextMessageEnd(TextMessageEndEvent event) {
+    _recordRunFirstResponse();
     final timestamp = DateTime.now();
     final items = _updateOrAddMessage(
       state.items,