feat(stroid): first working version

stroid generates o-grid topologies with proper boundary conditions applied. Currently the external domain does not work, this will be addressed in the next commit.

src/lib/topology/curvilinear.cpp

@@ -0,0 +1,41 @@
+#include "stroid/topology/curvilinear.h"
+#include "stroid/topology/mapping.h"
+
+#include <iostream>
+#include <memory>
+
+namespace stroid::topology {
+    void PromoteToHighOrder(mfem::Mesh &mesh, const fourdst::config::Config<config::MeshConfig> &config) {
+        const auto* fec = new mfem::H1_FECollection(config->order, mesh.Dimension());
+        auto* fes = new mfem::FiniteElementSpace(&mesh, fec, mesh.SpaceDimension());
+        mesh.SetNodalFESpace(fes);
+    }
+
+    void ProjectMesh(mfem::Mesh &mesh, const fourdst::config::Config<config::MeshConfig> &config) {
+        if (!mesh.GetNodes()) {
+            std::cerr << "Error: Mesh has no nodes to project. Call PromoteToHighOrder first." << std::endl;
+            return;
+        }
+
+        mfem::GridFunction& nodes = *mesh.GetNodes(); // Already confirmed not null
+        const mfem::FiniteElementSpace* fes = nodes.FESpace();
+
+        const int vDim = fes->GetVDim();
+        const int nDofs = fes->GetNDofs();
+
+        mfem::Vector pos(vDim);
+
+        for (int i = 0; i < nDofs; ++i) {
+            for (int d = 0; d < vDim; ++d) {
+                pos(d) = nodes(fes->DofToVDof(i, d));
+            }
+
+            TransformPoint(pos, config, 0);
+
+            for (int d = 0; d < vDim; ++d) {
+                nodes(fes->DofToVDof(i, d)) = pos(d);
+            }
+        }
+
+    }
+}