Remove ext-sockets dependency from Swoole adapter error handling

[Copilot]

The Swoole adapter was using socket_strerror() for error messages, requiring the ext-sockets extension unnecessarily.

Changes

• Replace socket_strerror($errorCode) with $client->errMsg in Swoole adapter error handling
• Use Swoole's native error reporting instead of socket extension functions

// Before
if (!$success) {
    $errorCode = $client->errCode;
    $errorMsg = socket_strerror($errorCode);  // Requires ext-sockets
    $this->closeClient($host, $port, $ssl);
    throw new Exception("Request failed: {$errorMsg} (Code: {$errorCode})");
}

// After
if (!$success) {
    $errorCode = $client->errCode;
    $errorMsg = $client->errMsg;  // Uses Swoole's built-in error message
    $this->closeClient($host, $port, $ssl);
    throw new Exception("Request failed: {$errorMsg} (Code: {$errorCode})");
}

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[Copilot]

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