fix: install libcore.so via CMake for proper packaging

linux/CMakeLists.txt

@@ -108,9 +108,14 @@ install(CODE "
 set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
 set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
 
-# Libcore is copied by build script, not cmake
-# install(FILES "../libcore/bin/lib/libcore.so" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
-#   COMPONENT Runtime)
+# Install custom libcore (49MB with FFI parse function)
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../libcore/bin/lib/libcore.so")
+  install(FILES "../libcore/bin/lib/libcore.so" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+  message(STATUS "Custom libcore.so will be installed")
+else()
+  message(WARNING "Custom libcore.so not found, application may fail at runtime")
+endif()
 
 install(
   FILES "../libcore/bin/HiddifyCli"