remove SDLAddressResolver

Tun/Punchnet/NetworkStack/SDLAddressResolver.swift

@@ -1,41 +0,0 @@
-//
-//  SDLAddressResolverPool.swift
-//  Tun
-//
-//  Created by 安礼成 on 2026/2/3.
-//
-
-import Foundation
-import NIOCore
-import NIOPosix
-
-actor SDLAddressResolver {
-    static let shared = SDLAddressResolver(threads: System.coreCount)
-    
-    private let pool: NIOThreadPool
-    private var cache: [String: SocketAddress] = [:]
-    
-    private init(threads: Int = 2) {
-        self.pool = NIOThreadPool(numberOfThreads: threads)
-        self.pool.start()
-    }
-    
-    func resolve(host: String, port: Int) async throws -> SocketAddress {
-        let key = "\(host):\(port)"
-        if let cached = cache[key] {
-            return cached
-        }
-        
-        let address = try await pool.runIfActive {
-            try SocketAddress.makeAddressResolvingHost(host, port: port)
-        }
-        cache[key] = address
-        
-        return address
-    }
-    
-    deinit {
-        pool.shutdownGracefully { _ in }
-    }
-    
-}