Summary

Normalize file_trans_system integration flags to KCENON_HAS_*.

5W1H Specification

• Who: file_trans_system maintainers
• What: Replace BUILD_WITH_COMMON_SYSTEM / BUILD_WITH_LOGGER_SYSTEM checks
• Where: integration paths and docs
• When: TBD
• Why: Align macro naming with unified convention
• How: Include feature_flags header and update macros

Parent Issue

kcenon/common_system#223

Tasks

• Include feature_flags.h in relevant headers/sources
• Replace BUILD_WITH_COMMON_SYSTEM / BUILD_WITH_LOGGER_SYSTEM with KCENON_HAS_*
• Update docs to reference KCENON_* macros

Acceptance Criteria

• Integration gates use KCENON_HAS_* macros
• Docs reflect the unified flag names