feat: custom IFC converter with C++ geometry injection

- Add custom IFC converter using web-ifc C++ DLL for geometry extraction
- Add GeometryInjector.cs: patches Speckle objects with mesh geometry
- Add NativeIfcGeometry.cs: P/Invoke bindings to WebIfcDll
- Add CustomMeshConverterFactory.cs: custom Xbim mesh converter
- Configure fileimport-service dotnet IFC pipeline
- Add VPS deployment config (docker-compose-vps.yml)
- Add dev scripts: run_backend.bat, run_frontend.bat, start_dev.bat
- Update .gitignore: exclude scratch/IFC-toolkit, engine_web-ifc
- Memory optimization for Xbim (MemoryModel mode)

run_speckle.bat

@@ -0,0 +1,20 @@
+@echo off
+echo ==============================================
+echo Kich hoat Node 22...
+call nvm use 22.19.0
+
+echo ==============================================
+echo Dang install packages...
+call yarn install
+
+echo ==============================================
+echo Dang build public resources...
+call yarn build:public
+
+echo ==============================================
+echo Dang build services...
+call yarn build
+
+echo ==============================================
+echo Khoi dong server...
+call yarn dev