feat: sync httpdns sdk/platform updates without large binaries

HttpDNSSDK/sdk/ios/NewHttpDNS/Network/HttpdnsNWReusableConnection.h

@@ -0,0 +1,48 @@
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class HttpdnsNWHTTPClient;
+
+@interface HttpdnsNWReusableConnection : NSObject
+
+@property (nonatomic, strong) NSDate *lastUsedDate;
+@property (nonatomic, assign) BOOL inUse;
+@property (nonatomic, assign, getter=isInvalidated, readonly) BOOL invalidated;
+
+- (instancetype)initWithClient:(HttpdnsNWHTTPClient *)client
+                          host:(NSString *)host
+                          port:(NSString *)port
+                        useTLS:(BOOL)useTLS NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+- (BOOL)openWithTimeout:(NSTimeInterval)timeout error:(NSError **)error;
+- (nullable NSData *)sendRequestData:(NSData *)requestData
+                             timeout:(NSTimeInterval)timeout
+              remoteConnectionClosed:(BOOL *)remoteConnectionClosed
+                               error:(NSError **)error;
+- (BOOL)isViable;
+- (void)invalidate;
+
+@end
+
+#if DEBUG
+// 测试专用：连接状态检查与操作
+@interface HttpdnsNWReusableConnection (DebugInspection)
+
+// 状态检查（这些属性已在主接口暴露，这里仅为文档明确）
+// @property lastUsedDate - 可读<E58FAF><E8AFBB>?
+// @property inUse - 可读<E58FAF><E8AFBB>?
+// @property invalidated - 只读
+
+// 测试辅助方法
+- (void)debugSetLastUsedDate:(nullable NSDate *)date;
+- (void)debugSetInUse:(BOOL)inUse;
+- (void)debugInvalidate;
+
+@end
+#endif
+
+NS_ASSUME_NONNULL_END
+