fix: MainActivity→ReactActivity(AS中MakeProject即可运行)

packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainActivity.kt

@@ -1,16 +1,12 @@
 package dev.yuzu.gca
 
-import android.os.Bundle
-import android.webkit.WebView
-import androidx.appcompat.app.AppCompatActivity
+import com.facebook.react.ReactActivity
+import com.facebook.react.ReactActivityDelegate
+import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
+import com.facebook.react.defaults.DefaultReactActivityDelegate
 
-class MainActivity : AppCompatActivity() {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        WebView(this).apply {
-            settings.javaScriptEnabled = true
-            settings.domStorageEnabled = true
-            loadUrl("file:///android_asset/shell.html")
-        }.also { setContentView(it) }
-    }
+class MainActivity : ReactActivity() {
+    override fun getMainComponentName(): String = "main"
+    override fun createReactActivityDelegate(): ReactActivityDelegate =
+        DefaultReactActivityDelegate(this, mainComponentName, fabricEnabled)
 }