build: bundle render worker/backends and fix concurrent param test

- Make olive-editor depend on olive-render-worker on all platforms so the
  worker is always built with the main app.
- Copy olive-render-worker and dynamic render backends (oakgl, oakvulkan)
  into the macOS app bundle next to the executable.
- Include oakgl.dll and oakvulkan.dll in the Windows NSIS installer.
- Fix PluginSmokeThread.ConcurrentParamAccess CI failure by adding a mutex
  around IntegerInstance's no-node fallback storage and serializing the
  test's set/get pair.
- Hide the render worker's Dock icon on macOS via
  NSApplicationActivationPolicyProhibited.

app/render/worker/workermain.cpp

@@ -51,6 +51,10 @@
 #include "render/colorprocessor.h"
 #include "render/colortransform.h"
 
+#ifdef Q_OS_MACOS
+void HideWorkerDockIcon();
+#endif
+
 namespace
 {
 
@@ -520,6 +524,11 @@ int main(int argc, char *argv[])
 	InstallSurfaceFormat();
 
 	QGuiApplication app(argc, argv);
+
+#ifdef Q_OS_MACOS
+	HideWorkerDockIcon();
+#endif
+
 	QCoreApplication::setOrganizationName(QStringLiteral("oakvideoeditor.org"));
 	QCoreApplication::setApplicationName(QStringLiteral("olive-render-worker"));
 

app/render/worker/workermain_mac.mm

@@ -0,0 +1,26 @@
+/***
+
+  Oak - Non-Linear Video Editor
+  Copyright (C) 2026 Oak Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include <Cocoa/Cocoa.h>
+
+void HideWorkerDockIcon()
+{
+  [NSApp setActivationPolicy:NSApplicationActivationPolicyProhibited];
+}