fix(python-bindings): added darwin duplicate rpath patch and fixed python rpath poiting

due to a current bug in meson-python duplicate rpaths are registered in the shared object files created by meson-python. The new masos dynamic loader refuses to load shared object files with duplicate rpaths. There is a small patch script which removes any duplicates. This is a temporary but effective fix (https://github.com/mesonbuild/meson-python/issues/813). Further, there was an issue due to mixed use of pure python and C++ code with name conflicts. This has been resolved so that both python and C++ code can be imported just find now.

build-python/import_debug.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+SITE=$(python3 -c "import site; print(site.getsitepackages()[0])")
+SO_FILE=$(find "$SITE/fourdst" -name "_phys.cpython-*-darwin.so")
+
+echo "=== File Locations ==="
+echo "Extension module: $SO_FILE"
+echo "Libs directory: $SITE/.fourdst.mesonpy.libs/"
+echo ""
+
+echo "=== RPATH Entries ==="
+otool -l "$SO_FILE" | grep -A 3 LC_RPATH
+echo ""
+
+echo "=== Library Dependencies ==="
+otool -L "$SO_FILE"
+echo ""
+
+echo "=== Checking if dependencies exist ==="
+for lib in $(otool -L "$SO_FILE" | grep -v ":" | awk '{print $1}' | grep -v "^/usr" | grep -v "^/System"); do
+    echo "Checking: $lib"
+    if [[ "$lib" == @* ]]; then
+        resolved=$(echo "$lib" | sed "s|@loader_path|$SITE/fourdst|g")
+        if [ -f "$resolved" ]; then
+            echo "  Found: $resolved"
+        else
+            echo "  NOT FOUND: $resolved"
+        fi
+    fi
+done
+echo ""
+
+echo "=== Attempting import with verbose error ==="
+python3 -c "
+import sys
+sys.path.insert(0, '$SITE')
+try:
+    import fourdst._phys
+    print('Import successful!')
+except ImportError as e:
+    print(f'Import failed: {e}')
+    import traceback
+    traceback.print_exc()
+"
+echo ""
+
+echo "=== Contents of .fourdst.mesonpy.libs ==="
+ls -lh "$SITE/.fourdst.mesonpy.libs/" 2>/dev/null || echo "Directory not found!"