MNT: store ref_factor on rocket aero surface components (#561)

[thatrandomasiandev]

Summary

• Extend Components.component_tuple with ref_factor (default 1.0) and pass it through Components.add, serialization, and call sites that unpacked (component, position).
• Compute and store ref_factor = (surface.rocket_radius / rocket.radius)**2 when adding aero surfaces; use the stored value in evaluate_center_of_pressure and rocket prints.
• Add unit tests for Components storage/round-trip and the Rocket add path.

Fixes #561

Test plan

• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 python -m pytest tests/unit/rocket/test_components.py tests/unit/rocket/test_rocket.py -q
• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 python -m pytest tests/unit/rocket/ tests/unit/test_rail_buttons_bending_moments.py tests/integration/test_sensor.py tests/unit/simulation/test_flight.py -q