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/lib/features/chat/data/tools/tool_registry.dart

@@ -4,13 +4,7 @@ typedef ToolHandler =
     Future<Map<String, dynamic>> Function(Map<String, dynamic> args);
 
 /// 工具常量
-const _toolNameCreateCalendar = 'create_calendar_event';
-const _toolNameNavigateRoute = 'navigate_to_route';
-const _defaultTimezone = 'Asia/Shanghai';
-const _defaultEventColor = '#4F46E5';
-const _defaultSourceType = 'agentGenerated';
-const _titleMinLength = 1;
-const _titleMaxLength = 100;
+const _toolNameNavigateRoute = 'front.navigate_to_route';
 
 class ToolDefinition {
   final String name;
@@ -33,38 +27,6 @@ class ToolRegistry {
   static void initialize() {
     if (_initialized) return;
 
-    _tools[_toolNameCreateCalendar] = ToolDefinition(
-      name: _toolNameCreateCalendar,
-      description: '创建一个日历事件或待办事项',
-      parameters: {
-        'type': 'object',
-        'properties': {
-          'title': {
-            'type': 'string',
-            'description': '事件标题',
-            'minLength': _titleMinLength,
-            'maxLength': _titleMaxLength,
-          },
-          'description': {'type': 'string', 'description': '事件描述'},
-          'startAt': {
-            'type': 'string',
-            'format': 'date-time',
-            'description': '开始时间 (ISO8601)',
-          },
-          'endAt': {
-            'type': 'string',
-            'format': 'date-time',
-            'description': '结束时间 (ISO8601)',
-          },
-          'timezone': {'type': 'string', 'default': _defaultTimezone},
-          'location': {'type': 'string'},
-          'notes': {'type': 'string'},
-        },
-        'required': ['title', 'startAt'],
-      },
-      handler: _handleCreateCalendarEvent,
-    );
-
     _tools[_toolNameNavigateRoute] = ToolDefinition(
       name: _toolNameNavigateRoute,
       description: '在前端执行路由跳转',
@@ -82,25 +44,6 @@ class ToolRegistry {
     _initialized = true;
   }
 
-  static Future<Map<String, dynamic>> _handleCreateCalendarEvent(
-    Map<String, dynamic> args,
-  ) async {
-    final eventId = 'evt_${DateTime.now().millisecondsSinceEpoch}';
-    return {
-      'eventId': eventId,
-      'ok': true,
-      'message': '日程已创建',
-      'title': args['title'],
-      'description': args['description'],
-      'startAt': args['startAt'],
-      'endAt': args['endAt'],
-      'timezone': args['timezone'] ?? _defaultTimezone,
-      'location': args['location'],
-      'color': _defaultEventColor,
-      'sourceType': _defaultSourceType,
-    };
-  }
-
   static Future<Map<String, dynamic>> _handleNavigateRoute(
     Map<String, dynamic> args,
   ) async {