Add quadratic tri and quad surface meshing

### 📝 Description of the feature

Hi @waltersma,
It would be great to have midside nodes for tri and quad surface meshing for structural analysis. The projection of corner nodes and midside nodes to the CAD surface would be necessary in this context as well.

### 💡 Steps for implementing the feature

_No response_

### 🔗 Useful links and references

_No response_

The issue requests midside nodes for triangular and quadrilateral surface meshing, plus projection of corner and midside nodes onto CAD surfaces. No files, tests, or entry points are identified; first map the existing surface-meshing implementation and its CAD projection path. Done means quadratic tri and quad meshes are supported with the requested projections for structural analysis.

Written by the indexing model from the issue text.