Use Boost::boost imported target in CMake configuration

[Copilot]

Addresses review feedback from #514 to modernize Boost dependency handling in CMake.

Changes

• Replaced manual target_include_directories with Boost::boost imported target
• Removed explicit ${Boost_INCLUDE_DIRS} variable usage

Before:

find_package(Boost REQUIRED)
target_include_directories(${TARGET_NAME} SYSTEM PUBLIC ${Boost_INCLUDE_DIRS})

target_link_libraries(
  ${TARGET_NAME}
  LINK_PUBLIC
    Triangle
    OpenMP::OpenMP_CXX
    Eigen3::Eigen
)

After:

find_package(Boost REQUIRED)

target_link_libraries(
  ${TARGET_NAME}
  LINK_PUBLIC
    Triangle
    OpenMP::OpenMP_CXX
    Eigen3::Eigen
    Boost::boost
)

The imported target automatically propagates include directories and follows CMake 3.5+ best practices.

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