fix(headers): moved all headers to fourdst/

tests/constants/constTest.cpp

@@ -1,11 +1,12 @@
 #include <gtest/gtest.h>
-#include "const.h"
 #include <iostream>
 #include <string>
 #include <vector>
 #include <set>
 #include <sstream>
 
+#include "fourdst/constants/const.h"
+
 /**
  * @file constTest.cpp
  * @brief Unit tests for the const class.

tests/constants/meson.build

@@ -12,8 +12,6 @@ foreach test_file : test_sources
       exe_name,
       test_file,
       dependencies: [gtest_dep, const_dep, gtest_main],
-      include_directories: include_directories('../../src/constants/public'),
-      link_with: libconst,  # Link the dobj library
       install_rpath: '@loader_path/../../src'  # Ensure runtime library path resolves correctly
   )