Initial clean commit

Example/SellyCloudSDK/Managers/AVConfigManager.h

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+//
+//  AVConfigManager.h
+//  AVDemo
+//
+
+#import <Foundation/Foundation.h>
+#import "AVVideoConfiguration.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface AVConfigManager : NSObject
+
+// Singleton
++ (instancetype)sharedManager;
+
+// Global default config
+@property (nonatomic, strong) AVVideoConfiguration *globalConfig;
+
+// 本地服务器设置
+@property (nonatomic, assign) BOOL localServerEnabled;
+@property (nonatomic, copy) NSString *localServerIP;
+
+// Load config from UserDefaults
+- (void)loadConfig;
+
+// Save config to UserDefaults
+- (void)saveConfig;
+
+// Generate random nickname (test + 3 digits)
++ (NSString *)generateRandomNickname;
+
+// 保存和读取单聊频道 ID
+- (void)saveCallChannelId:(NSString *)channelId;
+- (NSString *)loadCallChannelId;
+
+// 保存和读取会议频道 ID
+- (void)saveConferenceChannelId:(NSString *)channelId;
+- (NSString *)loadConferenceChannelId;
+
+@end
+
+NS_ASSUME_NONNULL_END