FIX: Resolve all paths to absolute before passing to NX

Root cause: Path.absolute() on Windows does NOT resolve '..' components.
sim_file_path was reaching NX as '...\studies\01_doe_landscape\..\..\models\Beam_sim1.sim'
NX likely can't resolve referenced parts from a path with '..' in it.

Fixes:
- nx_interface.py: glob from self.model_dir (resolved) not model_dir (raw)
- solver.py: sim_file.resolve() instead of sim_file.absolute()
- solve_simulation.py: os.path.abspath(sim_file_path) at entry point
- Diagnostic logging still in place for next run

projects/hydrotech-beam/studies/01_doe_landscape/iterations/iter001/params.json

@@ -0,0 +1,15 @@
+{
+  "iteration": 1,
+  "expressions": {
+    "beam_half_core_thickness": 25.162,
+    "beam_face_thickness": 21.504,
+    "holes_diameter": 300.0,
+    "hole_count": 10.0
+  },
+  "trial_input": {
+    "beam_half_core_thickness": 25.162,
+    "beam_face_thickness": 21.504,
+    "holes_diameter": 300.0,
+    "hole_count": 10
+  }
+}