fix(ios): 修复耳机检测逻辑以正确应用音频会话配置

重构耳机检测逻辑，使用统一的 `detectHeadphonesOutput` 方法替代分散的端口类型检查，提高代码可维护性并确保音频会话配置在不同耳机类型下的一致性。

local_plugins/azure_speech/ios/azure_speech/Sources/azure_speech/AzureTtsHelper.swift

@@ -1467,7 +1467,7 @@ private func applyAudioSessionForTTS() -> Bool {
         let hasWiredHeadphones = outputs.contains(where: { $0.portType == .headphones || $0.portType == .headsetMic })
         let hasBluetoothA2DP = outputs.contains(where: { $0.portType == .bluetoothA2DP || $0.portType == .bluetoothLE })
         let hasBluetoothHFP = outputs.contains(where: { $0.portType == .bluetoothHFP })
-        let hasHeadphones = hasWiredHeadphones || hasBluetoothA2DP || hasBluetoothHFP
+        let hasHeadphones = self.detectHeadphonesOutput()
         let otherAudioPlaying = audioSession.isOtherAudioPlaying
         let isRecording = (self.micCapture?.isCapturing == true)
         self.isHeadphones = hasHeadphones