chore(build): 3 个 Qt 工程声明平台插件 qt6_plugins

ViperMNIST / ViperAIChat / ViperQtHelloWorld 的 runtime 块补上 qt6_plugins: [platforms/qwindows.dll]，配合编译器新实现的运行时部署（TransPyV 36d23d2），使产物目录自带 Qt6*.dll 与 platforms/qwindows.dll，双击/直接运行即可，无需再设 QT_PLUGIN_PATH。

ViperAIChat/project.vpj

@@ -59,6 +59,7 @@
     },
     "runtime": {
         "qt6_path": "D:/Qt/6.11.2/mingw_64",
-        "qt6_dlls": ["Qt6Core.dll", "Qt6Gui.dll", "Qt6Widgets.dll", "Qt6Network.dll", "Qt6Charts.dll", "Qt6OpenGL.dll", "Qt6OpenGLWidgets.dll"]
+        "qt6_dlls": ["Qt6Core.dll", "Qt6Gui.dll", "Qt6Widgets.dll", "Qt6Network.dll", "Qt6Charts.dll", "Qt6OpenGL.dll", "Qt6OpenGLWidgets.dll"],
+        "qt6_plugins": ["platforms/qwindows.dll"]
     }
 }

ViperMNIST/project.vpj

@@ -67,6 +67,7 @@
             "Qt6Charts.dll",
             "Qt6OpenGL.dll",
             "Qt6OpenGLWidgets.dll"
-        ]
+        ],
+        "qt6_plugins": ["platforms/qwindows.dll"]
     }
 }

ViperQtHelloWorld/project.vpj

@@ -47,6 +47,7 @@
     },
     "runtime": {
         "qt6_path": "D:/Qt/6.11.2/mingw_64",
-        "qt6_dlls": ["Qt6Core.dll", "Qt6Gui.dll", "Qt6Widgets.dll", "Qt6Network.dll", "Qt6Charts.dll", "Qt6OpenGL.dll", "Qt6OpenGLWidgets.dll"]
+        "qt6_dlls": ["Qt6Core.dll", "Qt6Gui.dll", "Qt6Widgets.dll", "Qt6Network.dll", "Qt6Charts.dll", "Qt6OpenGL.dll", "Qt6OpenGLWidgets.dll"],
+        "qt6_plugins": ["platforms/qwindows.dll"]
     }
 }