Extend URIS valve to FSI simulation

Problem

Currently, the URIS valve implementation works correctly when only the fluid equations are solved. However, when used in an FSI simulation, the open/close condition checks mistakenly evaluate pressure and velocity in the structure mesh instead of only the fluid mesh. Additionally, when calculating the signed distance function, the code uses the global set of nodes (fluid + structure) rather than restricting to the fluid nodes. This does not affect the correctness of the simulation results, but it significantly slows the speed.

Solution

1. For the opening and closing conditions, perform integration on the fluid mesh only.
2. While calculating the SDF, use the total number of fluid nodes instead of the global total. A simple fix could be to add a loop at the beginning of uris_calc_sdf to iterate over all meshes and count fluid nodes.

Additional context

No response

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