实现缩放功能：增加缩放功能检索和设置方法，更新UI以支持缩放调整，增强缩放比例的状态管理。

lib/features/recording/platform/recording_platform.dart

@@ -81,6 +81,21 @@ class RecordingPlatform {
     return RecordingStatus.fromMap(result ?? const {});
   }
 
+  static Future<RecordingZoomCapabilities> getZoomCapabilities() async {
+    final result = await _channel.invokeMapMethod<String, dynamic>(
+      'getZoomCapabilities',
+    );
+    return RecordingZoomCapabilities.fromMap(result);
+  }
+
+  static Future<RecordingZoomCapabilities> setZoomRatio(double ratio) async {
+    final result = await _channel.invokeMapMethod<String, dynamic>(
+      'setZoomRatio',
+      <String, dynamic>{'zoomRatio': ratio},
+    );
+    return RecordingZoomCapabilities.fromMap(result);
+  }
+
   static Future<RecordingStartResult> startRecording({
     bool withAudio = true,
     bool enableDoNotDisturb = true,
@@ -156,6 +171,29 @@ class RecordingPlatform {
   }
 }
 
+class RecordingZoomCapabilities {
+  const RecordingZoomCapabilities({
+    required this.zoomRatio,
+    required this.minZoomRatio,
+    required this.maxZoomRatio,
+  });
+
+  final double zoomRatio;
+  final double minZoomRatio;
+  final double maxZoomRatio;
+
+  factory RecordingZoomCapabilities.fromMap(Map<String, dynamic>? map) {
+    final minZoomRatio = (map?['minZoomRatio'] as num?)?.toDouble() ?? 1.0;
+    final maxZoomRatio = (map?['maxZoomRatio'] as num?)?.toDouble() ?? 3.0;
+    final zoomRatio = (map?['zoomRatio'] as num?)?.toDouble() ?? minZoomRatio;
+    return RecordingZoomCapabilities(
+      zoomRatio: zoomRatio.clamp(minZoomRatio, maxZoomRatio).toDouble(),
+      minZoomRatio: minZoomRatio,
+      maxZoomRatio: maxZoomRatio,
+    );
+  }
+}
+
 class RecordingStartResult {
   const RecordingStartResult({this.outputPath, required this.status});