refactor(activity): 使用 Activity Result API 替换已弃用的 startActivityForResult

更新 MainActivity 以使用新的 Activity Result API 处理 SettingsActivity 返回的结果，替代已弃用的 startActivityForResult 和 onActivityResult 方法。这遵循了 Android 最新的开发实践，提高了代码的健壮性和可维护性。

app/src/main/java/com/example/lzwcai_terminal_temi/MainActivity.kt

@@ -15,6 +15,8 @@ import android.util.Base64
 import android.graphics.drawable.GradientDrawable
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ActivityCompat
+import androidx.activity.result.ActivityResultLauncher
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.core.content.ContextCompat
 import com.example.lzwcai_terminal_temi.databinding.ActivityMainBinding
 import com.robotemi.sdk.Robot
@@ -63,14 +65,9 @@ class MainActivity : AppCompatActivity(), OnRobotReadyListener, TtsListener, OnG
     private var liveKitManager: LiveKitManager? = null
     private var isLiveKitConnected = false
 
-    companion object {
-        private const val REQUEST_CLEAR_TASK = 1001
-    }
-
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        super.onActivityResult(requestCode, resultCode, data)
-        if (requestCode == REQUEST_CLEAR_TASK && resultCode == RESULT_OK) {
-            data?.getBooleanExtra("clear_task", false)?.let { clearTask ->
+    private val clearTaskLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
+        if (result.resultCode == RESULT_OK) {
+            result.data?.getBooleanExtra("clear_task", false)?.let { clearTask ->
                 if (clearTask) {
                     setCurrentTask("")
                 }
@@ -159,7 +156,7 @@ class MainActivity : AppCompatActivity(), OnRobotReadyListener, TtsListener, OnG
             lastArrivalLocation = prefs.getString("current_location", null)
         }
         binding.btnSettings.setOnClickListener {
-            startActivityForResult(Intent(this, SettingsActivity::class.java), REQUEST_CLEAR_TASK)
+            clearTaskLauncher.launch(Intent(this, SettingsActivity::class.java))
         }
 
         taskController = TaskController(