feat: offer Offline and Microsoft auth; keep authlib injector

Primary account creation entries are Offline and Microsoft. External
Yggdrasil / authlib-injector servers remain listed and addable for later
use. Offline creation is no longer redirected away or region-restricted.

HMCL/src/main/java/org/jackhuang/hmcl/setting/Accounts.java

@@ -55,8 +55,12 @@ public final class Accounts {
     public static final MicrosoftAccountFactory FACTORY_MICROSOFT = new MicrosoftAccountFactory(new MicrosoftService(OAUTH_CALLBACK));
     /// Account factories offered when creating a new account from the UI.
     ///
-    /// Offline login remains loadable for existing accounts, but is no longer offered for creation.
-    public static final List<AccountFactory<?>> FACTORIES = List.of(FACTORY_MICROSOFT, FACTORY_AUTHLIB_INJECTOR);
+    /// Primary: Offline and Microsoft. Authlib-injector remains available for external Yggdrasil servers.
+    public static final List<AccountFactory<?>> FACTORIES = List.of(
+            FACTORY_OFFLINE,
+            FACTORY_MICROSOFT,
+            FACTORY_AUTHLIB_INJECTOR
+    );
 
     // ==== login type / account factory mapping ====
     private static final Map<String, AccountFactory<?>> type2factory = new HashMap<>();

HMCL/src/main/java/org/jackhuang/hmcl/ui/account/AccountListPage.java

@@ -6,15 +6,15 @@ import javafx.beans.InvalidationListener;
 import javafx.beans.WeakInvalidationListener;
 import javafx.beans.binding.Bindings;
 import javafx.beans.property.*;
-import javafx.beans.value.ChangeListener;
-import javafx.beans.value.ObservableValue;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.scene.control.ScrollPane;
 import javafx.scene.control.Tooltip;
 import javafx.scene.layout.VBox;
 import org.jackhuang.hmcl.auth.Account;
+import org.jackhuang.hmcl.auth.AccountFactory;
 import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
+import org.jackhuang.hmcl.setting.Accounts;
 import org.jackhuang.hmcl.setting.SettingsManager;
 import org.jackhuang.hmcl.ui.Controllers;
 import org.jackhuang.hmcl.ui.FXUtils;
@@ -23,7 +23,6 @@ import org.jackhuang.hmcl.ui.WeakListenerHolder;
 import org.jackhuang.hmcl.ui.construct.AdvancedListItem;
 import org.jackhuang.hmcl.ui.decorator.DecoratorAnimatedPage;
 import org.jackhuang.hmcl.ui.decorator.DecoratorPage;
-import org.jackhuang.hmcl.util.RegionUtils;
 import org.jackhuang.hmcl.util.javafx.BindingMapping;
 import org.jackhuang.hmcl.util.javafx.MappedObservableList;
 import org.jetbrains.annotations.Nullable;
@@ -31,33 +30,13 @@ import org.jetbrains.annotations.UnmodifiableView;
 
 import java.util.Locale;
 
-import static org.jackhuang.hmcl.setting.SettingsManager.userSettings;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 import static org.jackhuang.hmcl.util.javafx.ExtendedProperties.createSelectedItemPropertyFor;
 
 /// Displays account creation methods and the configured account list.
 public final class AccountListPage extends DecoratorAnimatedPage implements DecoratorPage {
-    /// Whether offline and third-party account creation is restricted.
-    static final BooleanProperty RESTRICTED = new SimpleBooleanProperty(true);
-
-    static {
-        String property = System.getProperty("hmcl.offline.auth.restricted", "auto");
-
-        if ("false".equals(property)
-                || "auto".equals(property) && "CN".equals(RegionUtils.MACHINE_REGION)
-                || SettingsManager.userSettings().enableOfflineAccountProperty().get())
-            RESTRICTED.set(false);
-        else
-            userSettings().enableOfflineAccountProperty().addListener(new ChangeListener<Boolean>() {
-                @Override
-                public void changed(ObservableValue<? extends Boolean> o, Boolean oldValue, Boolean newValue) {
-                    if (newValue) {
-                        userSettings().enableOfflineAccountProperty().removeListener(this);
-                        RESTRICTED.set(false);
-                    }
-                }
-            });
-    }
+    /// Offline / authlib-injector creation is always allowed for this fork.
+    static final BooleanProperty RESTRICTED = new SimpleBooleanProperty(false);
 
     /// The account entries derived from the configured accounts.
     private final @UnmodifiableView ObservableList<AccountListItem> items;
@@ -77,6 +56,12 @@ public final class AccountListPage extends DecoratorAnimatedPage implements Deco
         items = MappedObservableList.create(accounts, AccountListItem::new);
         selectedAccount = createSelectedItemPropertyFor(items, Account.class);
 
+        AdvancedListItem offlineItem = new AdvancedListItem();
+        offlineItem.getStyleClass().add("navigation-drawer-item");
+        offlineItem.setTitle(i18n("account.methods.offline"));
+        offlineItem.setLeftIcon(SVG.PERSON);
+        offlineItem.setOnAction(e -> openCreateAccount(Accounts.FACTORY_OFFLINE));
+
         AdvancedListItem microsoftItem = new AdvancedListItem();
         microsoftItem.getStyleClass().add("navigation-drawer-item");
         microsoftItem.setTitle(i18n("account.methods.microsoft"));
@@ -90,14 +75,14 @@ public final class AccountListPage extends DecoratorAnimatedPage implements Deco
         });
 
         InvalidationListener buildSidebarListener = observable -> {
-            boolean restricted = RESTRICTED.get();
-
             getSidebar().clear();
 
             getSidebar()
                     .startCategory(i18n("account.create").toUpperCase(Locale.ROOT))
+                    .add(offlineItem)
                     .add(microsoftItem);
 
+            // External Yggdrasil / authlib-injector servers stay listed for future use.
             for (AuthlibInjectorServer server : authServers) {
                 AdvancedListItem item = new AdvancedListItem();
                 item.getStyleClass().add("navigation-drawer-item");
@@ -110,24 +95,13 @@ public final class AccountListPage extends DecoratorAnimatedPage implements Deco
                     }
                 });
 
-                ObservableValue<String> title = BindingMapping.of(server, AuthlibInjectorServer::getName);
+                var title = BindingMapping.of(server, AuthlibInjectorServer::getName);
                 item.titleProperty().bind(title);
                 item.setSubtitle(server.getDisplayHostUrl());
 
                 Tooltip tooltip = new Tooltip();
-                if (restricted) {
-                    tooltip.setText(i18n("account.login.restricted"));
-                    item.setActionDisabled(true);
-                } else {
-                    tooltip.textProperty().bind(Bindings.format("%s (%s)", title, server.getUrl()));
-                    item.setOnAction(e -> {
-                        if (SettingsManager.isUserGameAccountsReadOnly()) {
-                            confirmOverwriteUserAccounts(() -> Controllers.dialog(new CreateAccountPane(server)));
-                        } else {
-                            Controllers.dialog(new CreateAccountPane(server));
-                        }
-                    });
-                }
+                tooltip.textProperty().bind(Bindings.format("%s (%s)", title, server.getUrl()));
+                item.setOnAction(e -> openCreateAccount(Accounts.getAccountFactoryByAuthlibInjectorServer(server)));
                 FXUtils.installFastTooltip(item, tooltip);
 
                 getSidebar().add(item);
@@ -138,7 +112,6 @@ public final class AccountListPage extends DecoratorAnimatedPage implements Deco
 
         WeakInvalidationListener weakBuildSidebarListener = holder.weak(buildSidebarListener);
         authServers.addListener(weakBuildSidebarListener);
-        RESTRICTED.addListener(weakBuildSidebarListener);
 
         AdvancedListItem addAuthServerItem = new AdvancedListItem();
         addAuthServerItem.getStyleClass().add("navigation-drawer-item");
@@ -171,6 +144,14 @@ public final class AccountListPage extends DecoratorAnimatedPage implements Deco
         setContent(scrollPane);
     }
 
+    private void openCreateAccount(AccountFactory<?> factory) {
+        if (SettingsManager.isUserGameAccountsReadOnly()) {
+            confirmOverwriteUserAccounts(() -> Controllers.dialog(new CreateAccountPane(factory)));
+        } else {
+            Controllers.dialog(new CreateAccountPane(factory));
+        }
+    }
+
     /// Returns the account selection shared with the launcher.
     public ObjectProperty<@Nullable Account> selectedAccountProperty() {
         return selectedAccount;

HMCL/src/main/java/org/jackhuang/hmcl/ui/account/CreateAccountPane.java

@@ -81,20 +81,15 @@ public class CreateAccountPane extends JFXDialogLayout implements DialogAware {
 
     public CreateAccountPane(AccountFactory<?> factory) {
         if (factory == null) {
-            if (AccountListPage.RESTRICTED.get()) {
-                showMethodSwitcher = false;
-                factory = Accounts.FACTORY_MICROSOFT;
-            } else {
-                showMethodSwitcher = true;
-                String preferred = settings().preferredLoginTypeProperty().get();
-                try {
-                    factory = Accounts.getAccountFactory(preferred);
-                    if (factory == Accounts.FACTORY_OFFLINE) {
-                        factory = Accounts.FACTORY_MICROSOFT;
-                    }
-                } catch (IllegalArgumentException e) {
-                    factory = Accounts.FACTORY_MICROSOFT;
+            showMethodSwitcher = true;
+            String preferred = settings().preferredLoginTypeProperty().get();
+            try {
+                factory = Accounts.getAccountFactory(preferred);
+                if (!Accounts.FACTORIES.contains(factory)) {
+                    factory = Accounts.FACTORY_OFFLINE;
                 }
+            } catch (IllegalArgumentException e) {
+                factory = Accounts.FACTORY_OFFLINE;
             }
         } else {
             showMethodSwitcher = false;