chore/docs: align ros2-ftrace-viewer naming and clarify ROS/Autoware workflow

Ching-Hao Liurequested to merge
feature/refactor into main
  • Align project naming to ros2-ftrace-viewer, including window title, backend docstring, and README paths, and add a base .gitignore for venv/bytecode/logs.
  • Clarify the recommended Autoware/ROS 2 startup order and that the GUI must be started from a setup.bash–sourced shell for Node→PID resolution.
  • Refine setup.sh/start.sh hints to show that only the GUI terminal needs ROS/Autoware, while start.sh itself does not.

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