Revert "userspace: implement OSS ksuinit"

This reverts commit edb99a2c1a.

manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Install.kt

@@ -81,6 +81,35 @@ import com.rifsxd.ksunext.ui.util.rootAvailable
 @Destination<RootGraph>
 @Composable
 fun InstallScreen(navigator: DestinationsNavigator) {
+    var showLkmWarning by rememberSaveable { mutableStateOf(true) }
+
+    if (showLkmWarning) {
+        AlertDialog(
+            onDismissRequest = {
+                showLkmWarning = false
+                navigator.popBackStack()
+            },
+            title = { Text(
+                text = stringResource(R.string.warning),
+                style = MaterialTheme.typography.titleLarge,
+                fontWeight = FontWeight.SemiBold
+            ) },
+            text = { Text(stringResource(R.string.lkm_warning_message)) },
+            confirmButton = {
+                TextButton(onClick = { showLkmWarning = false }) {
+                    Text(stringResource(R.string.proceed))
+                }
+            },
+            dismissButton = {
+                TextButton(onClick = {
+                    showLkmWarning = false
+                    navigator.popBackStack()
+                }) {
+                    Text(stringResource(R.string.cancel))
+                }
+            }
+        )
+    }
 
     var installMethod by remember {
         mutableStateOf<InstallMethod?>(null)