Initial clean commit

Example/SellyCloudSDK/VideoCall/SLSParticipant.h

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+//
+//  SLSParticipant.h
+//  SellyCloudSDK_Example
+//
+//  Created by Caleb on 13/11/25.
+//  Copyright © 2025 Caleb. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface SLSParticipant : NSObject
+
+@property (nonatomic, copy)   NSString *uid;
+@property (nonatomic, copy)   NSString *displayName;
+
+/// 音量 0~1，用来做说话者高亮
+@property (nonatomic, assign) CGFloat   level;
+
+/// 音频 / 视频 是否静音
+@property (nonatomic, assign) BOOL      audioMuted;
+@property (nonatomic, assign) BOOL      videoMuted;
+
+/// 上次活跃时间（可选，用于后面做发言排序等）
+@property (nonatomic, strong) NSDate   *lastActiveAt;
+@end
+
+NS_ASSUME_NONNULL_END