v1.0.0.4

• Fix critical DailyFileSink bug: prevent file overwrites on program restart
  • Remove current_day_index_ member to eliminate restart index reset issue
  • Add rotate_files_for_date() helper function to properly rotate existing files
  • Implement startup rotation check in constructor to handle old log files
  • Fix max_files enforcement to prevent creating files beyond the limit
  • Support max_file_size=0 to disable size-based rotation
  • Proper handling of dated files as index 0 with indexed files starting from _001
• Add comprehensive unit tests for DailyFileSink rotation scenarios
  • Test size rotation with max_files limit enforcement
  • Test restart scenarios with old files from previous days
  • Test restart with existing rotated files to prevent overwrites