CTest: integrate example as optional test (PRIVATEBIN_IT-gated) and ensure DLL copy; wire example into root CMake

example/CMakeLists.txt

@@ -24,4 +24,13 @@ target_link_libraries(example PRIVATE ${PRIVATEBINAPI_LIB} winhttp)
 
 target_include_directories(example PRIVATE 
     ${CMAKE_CURRENT_SOURCE_DIR}/../include
-)
+)
+
+# Install/run helpers for tests: copy DLL next to example on Windows
+if(WIN32)
+    add_custom_command(TARGET example POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different
+                ${PRIVATEBINAPI_BUILD_DIR}/Release/privatebinapi.dll
+                $<TARGET_FILE_DIR:example>
+    )
+endif()