feat: Service Registry + Bridge 解耦架构 + 全工程代码清理

## 架构升级：Service Registry + Bridge 模式

- 新增 PluginSDK/IPluginServices.h：10 个纯虚服务接口(IDataProvider/ILinkProvider/...)
- 新增 MavLinkServiceBridge：单 QObject 实现全部服务，隔离 MavLinkNode 依赖
- 升级 PluginManifest：支持 plugin.json 的 provides/consumes 声明式依赖
- 实现 ExtensionHost::autoWire()：元对象自省自动连接信号槽
- 集成到 AppController：initModules() 中创建桥接器并注册到 ServiceRegistry
- CockpitPlugin 演示服务发现：initialize() 中通过 PluginContext 查找服务

## 代码清理

- Plugins/opmap：~280 行死代码(waypointsetting 100行注释块/tilematrix 54行/等27个文件)
- Plugins/MavLinkNode：~200 行 GBK 乱码注释翻译为 UTF-8 + 12 行注释死代码
- Plugins/ToolsUI：~222 行死代码(ECU.cpp 82行/INS.cpp 113行/Parse/ToolsUI 等)
- StatusUI/Setting/MissionUI：~65 行注释死代码
- Cockpit/leftladder.cpp：10 处 GBK 乱码翻译为中文
- 清理头文件注释掉的 #include(19 处)、空 if-else 分支、注释变量声明

## 编译验证

- [100%] Built target GCS 零错误
- 运行时 timeout 3s 正常退出，无崩溃

Plugins/opmap/mapwidget/MissionManager/QGCFencePolygon.h

@@ -0,0 +1,57 @@
+/****************************************************************************
+ *
+ * (c) 2009-2020 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ *
+ * QGroundControl is licensed according to the terms in the file
+ * COPYING.md in the root of the source code directory.
+ *
+ ****************************************************************************/
+
+#pragma once
+
+#include "QGCMapPolygon.h"
+
+/// The QGCFencePolygon class provides a polygon used by GeoFence support.
+class QGCFencePolygon : public QGCMapPolygon
+{
+    Q_OBJECT
+
+public:
+    QGCFencePolygon(bool inclusion, QObject* parent = nullptr);
+    QGCFencePolygon(const QGCFencePolygon& other, QObject* parent = nullptr);
+
+    const QGCFencePolygon& operator=(const QGCFencePolygon& other);
+
+    Q_PROPERTY(bool inclusion READ inclusion WRITE setInclusion NOTIFY inclusionChanged)
+
+    /// Saves the QGCFencePolygon to the json object.
+    ///     @param json Json object to save to
+    void saveToJson(QJsonObject& json);
+
+    /// Load a QGCFencePolygon from json
+    ///     @param json Json object to load from
+    ///     @param required true: no polygon in object will generate error
+    ///     @param errorString Error string if return is false
+    /// @return true: success, false: failure (errorString set)
+    bool loadFromJson(const QJsonObject& json, bool required, QString& errorString);
+
+    // Property methods
+
+    bool inclusion      (void) const { return _inclusion; }
+    void setInclusion   (bool inclusion);
+
+signals:
+    void inclusionChanged   (bool inclusion);
+
+private slots:
+    void _setDirty(void);
+
+private:
+    void _init(void);
+
+    bool _inclusion;
+
+    static const int _jsonCurrentVersion = 1;
+
+    static const char* _jsonInclusionKey;
+};