Store command in PID file and display in list/status output

- Add PidFileData struct to represent PID file contents
- Store both PID and command in PID file (first line: PID, remaining lines: command args)
- Implement write_to_file() and read_from_file() methods for structured data handling
- Update run_daemon() to write command alongside PID
- Update all functions to use PidFileData instead of raw PID parsing:
  - is_process_running()
  - stop_daemon()
  - list_daemons() - now shows actual command instead of "N/A"
  - status_daemon() - shows command in detailed output
  - clean_orphaned_files()
- Add command_string() method for formatted display
- Maintain backward compatibility with error handling for invalid PID files
- All tests pass, command display works correctly

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

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