Fix CardDAV authentication and allow multiple accounts

CardDAV fixes:
- Extract domain from URI for auth info lookup
- Auto-populate realm from host if empty
- Add domain parameter to createAuthInfo for proper auth matching
- Update liblinphone submodule with setAuthInfo fix

UI improvements:
- Allow multiple CardDAV accounts (removed count==0 restriction)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Linphone/model/address-books/carddav/CarddavModel.cpp

@@ -22,6 +22,7 @@
 #include "model/core/CoreModel.hpp"
 #include "model/setting/SettingsModel.hpp"
 #include "tool/Utils.hpp"
+#include <QUrl>
 
 DEFINE_ABSTRACT_OBJECT(CarddavModel)
 
@@ -59,16 +60,32 @@ void CarddavModel::save(
 	mustBeInLinphoneThread(log().arg(Q_FUNC_INFO));
 	auto core = CoreModel::getInstance()->getCore();
 
+	// Extract domain from URI for auth info lookup
+	string domain;
+	QUrl url(QString::fromStdString(uri));
+	if (url.isValid()) {
+		domain = url.host().toStdString();
+	}
+
+	// If realm is empty, use domain as default realm
+	if (realm.empty() && !domain.empty()) {
+		realm = domain;
+		lInfo() << log().arg("Using host as default realm:") << realm;
+	}
+
+	lInfo() << log().arg("CardDAV save called with:") << " displayName=" << displayName << " uri=" << uri
+	        << " username=" << username << " realm=" << realm << " domain=" << domain << " (password hidden)";
+
 	// Auth info handled in lazy mode, if provided handle otherwise ignore.
 	// TODO: add dialog to ask user before removing existing auth info if existing already - (comment from Android)
 	if (!username.empty() && !realm.empty()) {
-		mRemovedAuthInfo = core->findAuthInfo(realm, username, "");
+		mRemovedAuthInfo = core->findAuthInfo(realm, username, domain);
 		if (mRemovedAuthInfo != nullptr) {
 			lWarning() << log().arg("Auth info with username ") << username << " already exists, removing it first.";
 			core->removeAuthInfo(mRemovedAuthInfo);
 		}
-		lInfo() << log().arg("Adding auth info with username") << username;
+		lInfo() << log().arg("Adding auth info with username ") << username << " and domain " << domain;
-		mCreatedAuthInfo = linphone::Factory::get()->createAuthInfo(username, "", password, "", realm, "");
+		mCreatedAuthInfo = linphone::Factory::get()->createAuthInfo(username, "", password, "", realm, domain);
 		core->addAuthInfo(mCreatedAuthInfo);
 	} else {
 		lInfo() << log().arg("No auth info provided upon saving.");

Linphone/view/Page/Layout/Settings/ContactsSettingsLayout.qml

@@ -79,7 +79,8 @@ AbstractSettingsLayout {
 			accessibleUseButtonText: qsTr("use_cardav_server_accessible_name")
 			proxyModel: CarddavProxy {
 				onModelReset:  {
-					carddavProvider.showAddButton = carddavProvider.proxyModel.count == 0
+					// Allow multiple CardDAV accounts
+					carddavProvider.showAddButton = true
 					carddavProvider.newItemGui = createGuiObject('Carddav')
 				}
 			}

external/linphone-sdk

@@ -1 +1 @@
-Subproject commit 2e6e6b927ce202f6948da02ea33081a52b89bf48
+Subproject commit 4193a9481e6d8530bec6f6af26efb59285a53e0e