feat(agent): add voice input capability and standardize tool naming

- Add voice recording with transcribe endpoint (ASR) for multimodal input
- Android: add RECORD_AUDIO and INTERNET permissions
- Refactor tool naming: frontend tools use 'front.' prefix, backend tools use 'back.'
- Migrate calendar tools: create_calendar_event -> back.mutate/list/delete events
- Add calendar_event_list.v1 and calendar_operation.v1 UI card types
- Update all Flutter and Python tests to match new tool naming conventions
- Add record package dependency for voice recording

apps/test/features/chat/ag_ui_event_test.dart

@@ -194,7 +194,7 @@ void main() {
       final json = {
         'type': 'TOOL_CALL_START',
         'toolCallId': 'tc_123',
-        'toolCallName': 'create_calendar_event',
+        'toolCallName': 'back.mutate_calendar_event',
         'parentMessageId': 'msg_001',
       };
 
@@ -203,7 +203,7 @@ void main() {
       expect(event, isA<ToolCallStartEvent>());
       final toolStart = event as ToolCallStartEvent;
       expect(toolStart.toolCallId, 'tc_123');
-      expect(toolStart.toolCallName, 'create_calendar_event');
+      expect(toolStart.toolCallName, 'back.mutate_calendar_event');
       expect(toolStart.parentMessageId, 'msg_001');
     });
 
@@ -265,6 +265,37 @@ void main() {
       expect(toolResult.result['eventId'], 'evt_001');
     });
 
+    test('ToolCallResultEvent.ui parses from payload.ui', () {
+      final json = {
+        'type': 'TOOL_CALL_RESULT',
+        'messageId': 'msg_123',
+        'toolCallId': 'tc_123',
+        'content':
+            '{"ui":{"type":"calendar_card.v1","version":"v1","data":{"id":"evt_1","title":"会议","startAt":"2026-03-01T10:00:00Z"},"actions":[]}}',
+      };
+
+      final event = AgUiEvent.fromJson(json) as ToolCallResultEvent;
+      expect(event.ui, isNotNull);
+      expect(event.ui!.cardType, 'calendar_card.v1');
+    });
+
+    test(
+      'ToolCallResultEvent.ui parses from payload.result when result is UiCard',
+      () {
+        final json = {
+          'type': 'TOOL_CALL_RESULT',
+          'messageId': 'msg_123',
+          'toolCallId': 'tc_123',
+          'content':
+              '{"result":{"type":"calendar_operation.v1","version":"v1","data":{"operation":"delete","ok":true},"actions":[]}}',
+        };
+
+        final event = AgUiEvent.fromJson(json) as ToolCallResultEvent;
+        expect(event.ui, isNotNull);
+        expect(event.ui!.cardType, 'calendar_operation.v1');
+      },
+    );
+
     test('parses ToolCallErrorEvent', () {
       final json = {
         'type': 'TOOL_CALL_ERROR',