refactor(ddm): switch treeland IPC to Qt Remote Objects

Replace the greeter IPC bridge with Qt Remote Objects endpoints.
Use DDMRemote and TreelandRemote as cross-process call contracts.

将 greeter IPC 桥接改为 Qt Remote Objects 端点。
使用 DDMRemote 和 TreelandRemote 作为跨进程调用契约。

Log: 切换 Treeland 与 DDM 的 IPC 到 Qt Remote Objects
Influence: 规范远程对象和 socket 命名，影响 DDM 与 Treeland 的登录/切换通信。

Author: zccrs

src/CMakeLists.txt

@@ -148,6 +148,7 @@ qt_add_qml_module(libtreeland
         effects/tsgradiusimagenode.h
         $<$<OR:$<NOT:$<BOOL:${DISABLE_DDM}>>,$<BOOL:${EXT_SESSION_LOCK_V1}>>:core/lockscreen.h>
         $<$<OR:$<NOT:$<BOOL:${DISABLE_DDM}>>,$<BOOL:${EXT_SESSION_LOCK_V1}>>:core/lockscreen.cpp>
+        $<$<NOT:$<BOOL:${DISABLE_DDM}>>:greeter/ddmremote.rep>
         $<$<NOT:$<BOOL:${DISABLE_DDM}>>:greeter/greeterproxy.cpp>
         $<$<NOT:$<BOOL:${DISABLE_DDM}>>:greeter/greeterproxy.h>
         $<$<NOT:$<BOOL:${DISABLE_DDM}>>:greeter/sessionmodel.cpp>
@@ -266,6 +267,12 @@ qt_add_qml_module(libtreeland
         ${PROJECT_BINARY_DIR}/qt/qml/Treeland
 )
 
+if (NOT DISABLE_DDM)
+    qt_add_repc_replicas(libtreeland
+        ${CMAKE_CURRENT_SOURCE_DIR}/greeter/ddmremote.rep
+    )
+endif()
+
 qt_add_repc_sources(libtreeland
     modules/resource/treelandwindowtree.rep
 )

src/greeter/ddmremote.rep

@@ -0,0 +1,23 @@
+// Copyright (C) 2026 UnionTech Software Technology Co., Ltd.
+// SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+class DDMRemote {
+    PROP(QString hostName SOURCEONLYSETTER)
+    PROP(bool canPowerOff=false SOURCEONLYSETTER)
+    PROP(bool canReboot=false SOURCEONLYSETTER)
+    PROP(bool canSuspend=false SOURCEONLYSETTER)
+    PROP(bool canHibernate=false SOURCEONLYSETTER)
+    PROP(bool canHybridSleep=false SOURCEONLYSETTER)
+    SIGNAL(loginFailed(QString user))
+    SIGNAL(informationMessage(QString message))
+    SIGNAL(userSessionAdded(QString user, int sessionId))
+    SIGNAL(userSessionRemoved(QString user, int sessionId))
+    SLOT(bool connectGreeter())
+    SLOT(bool login(QString user, QString password, int sessionType, QString sessionFile))
+    SLOT(bool logout(int id))
+    SLOT(bool powerOff())
+    SLOT(bool reboot())
+    SLOT(bool suspend())
+    SLOT(bool hibernate())
+    SLOT(bool hybridSleep())
+};