refactor: split PluginManager into DccPluginLoader and DccPluginManager

Extract plugin loading state machine from PluginData into DccPluginLoader class
with signal-driven auto-advancing states. Simplify PluginManager (renamed to
DccPluginManager) to only handle scheduling, thread pool and lifecycle management.
Fix display module unnecessary delayed initialization and adjust root/engine
deletion order in cleanup.

将PluginData中的插件加载逻辑提取为DccPluginLoader类，使用信号驱动状态机自动推进。
简化PluginManager（重命名为DccPluginManager）为调度协调角色，仅管理线程池和生命周期。
修复DisplayModule不必要的延迟初始化，调整清理时root/engine的删除顺序。

Log: 重构插件加载架构，分离加载逻辑与调度管理
Influence: 1. 控制中心各模块正常加载和显示；2. 插件隐藏/取消隐藏功能正常；3. 异步数据加载正常；4. 模块切换和页面导航正常

Author: caixr23

src/dde-control-center/dccmanager.cpp

@@ -7,7 +7,7 @@
 #include "dccimageprovider.h"
 #include "dccobject_p.h"
 #include "navigationmodel.h"
-#include "pluginmanager.h"
+#include "dccpluginmanager.h"
 #include "searchmodel.h"
 
 #include <DGuiApplicationHelper>
@@ -58,7 +58,7 @@ DccManager::DccManager(QObject *parent)
     , m_hideObjects(new DccObject(this))
     , m_noAddObjects(new DccObject(this))
     , m_noParentObjects(new DccObject(this))
-    , m_plugins(new PluginManager(this))
+    , m_plugins(new DccPluginManager(this))
     , m_window(nullptr)
     , m_dconfig(DConfig::create("org.deepin.dde.control-center", "org.deepin.dde.control-center", QString(), this))
     , m_engine(nullptr)
@@ -97,8 +97,8 @@ DccManager::DccManager(QObject *parent)
 #endif
 
     initConfig();
-    connect(m_plugins, &PluginManager::addObject, this, &DccManager::addObject);
-    connect(m_plugins, &PluginManager::loadAllFinished, this, &DccManager::handleShowReady, Qt::QueuedConnection);
+    connect(m_plugins, &DccPluginManager::addObject, this, &DccManager::addObject);
+    connect(m_plugins, &DccPluginManager::loadAllFinished, this, &DccManager::handleShowReady, Qt::QueuedConnection);
     m_showTimer = new QTimer(this);
     m_showTimer->setInterval(60);
     m_showTimer->setSingleShot(true);
@@ -380,7 +380,7 @@ QString DccManager::searchProxy(const QString &json) const
             setDelayedReply(true);
             QObject::connect(
                     m_plugins,
-                    &PluginManager::loadAllFinished,
+                    &DccPluginManager::loadAllFinished,
                     this,
                     [this, json, message]() {
                         const auto &ret = this->search(json);
@@ -1166,11 +1166,9 @@ void DccManager::clearData()
 #ifdef DCC_ENABLE_MEMORY_MANAGEMENT
     // TODO: delete m_engine会有概率崩溃
     m_window = nullptr;
-    qCDebug(dccLog()) << "delete root begin";
     DccObject *root = m_root;
     m_root = nullptr;
     Q_EMIT rootChanged(m_root);
-    qCDebug(dccLog()) << "delete root end";
 
     qCDebug(dccLog()) << "delete clearData hide:" << m_hideObjects->getChildren().size() << "noAdd:" << m_noAddObjects->getChildren().size() << "noParent" << m_noParentObjects->getChildren().size();
     delete m_noParentObjects;
@@ -1181,7 +1179,9 @@ void DccManager::clearData()
     delete m_engine;
     qCDebug(dccLog()) << "clear QmlEngine";
     m_engine = nullptr;
+    qCDebug(dccLog()) << "delete root begin";
     delete root;
+    qCDebug(dccLog()) << "delete root end";
 #endif
 }
 
@@ -1191,7 +1191,7 @@ void DccManager::waitLoadFinished() const
         QEventLoop loop;
         QTimer timer;
         connect(&timer, &QTimer::timeout, &loop, &QEventLoop::quit);
-        connect(m_plugins, &PluginManager::loadAllFinished, &loop, &QEventLoop::quit);
+        connect(m_plugins, &DccPluginManager::loadAllFinished, &loop, &QEventLoop::quit);
         timer.start(5000);
         loop.exec();
     }

src/dde-control-center/dccmanager.h

@@ -23,7 +23,7 @@ QT_END_NAMESPACE
 namespace dccV25 {
 class NavigationModel;
 class SearchModel;
-class PluginManager;
+class DccPluginManager;
 class DccImageProvider;
 
 class DccManager : public DccApp, protected QDBusContext
@@ -135,7 +135,7 @@ private Q_SLOTS:
     QVector<DccObject *> m_currentObjects;   // 当前显示的页面路径，从根页面到当前页面
     QVector<DccObject *> m_triggeredObjects; // 用户交互触发的对象路径，从根菜单到当前子控件
 
-    PluginManager *m_plugins;
+    DccPluginManager *m_plugins;
     QPointer<QWindow> m_window;
     Dtk::Core::DConfig *m_dconfig;
     QSet<QString> m_hideModule;