chore: add explicit PUBLIC scope to macOS target_link_libraries

Follow-up to PR #22 (Issue #21) - clarify CMake scope keywords:

- target_compile_options: PRIVATE (don't force compile flags on consumers)
- target_link_libraries: PUBLIC (auto-propagate link dependencies to consumers)

This ensures users linking ccap automatically get the required Apple
frameworks without manually adding them to their projects.

Author: wysaid

CMakeLists.txt

@@ -159,7 +159,7 @@ endif()
 
 if(APPLE)
     target_compile_options(ccap PRIVATE -fobjc-arc)
-    target_link_libraries(ccap
+    target_link_libraries(ccap PUBLIC
         "-framework Foundation"
         "-framework AVFoundation"
         "-framework CoreVideo"