[FEATURE] Add named wind axes force properties and unify sign rules

[BorniaPedro]

Description

Adds named wind axes force and force coefficient read-only properties to Airplane and Panel, centralizes the scalar types vocabulary in _output_rendering, replaces manual component negations across the output modules, and documents named wind axes force definitions in docs/AXES_POINTS_AND_FRAMES.md.

Motivation

Physical load quantities like induced drag and lift were previously re-derived at multiple sites across the output modules by manually negating raw wind axes x and z vector components. Centralizing these physical quantities into named properties on Airplane and Panel places load knowledge with the load classes, avoids repeated sign negation rules, and establishes a single canonical source for the scalar type vocabulary across visualization functions.

Relevant Issues

Closes #262 .

Changes

• Added public read-only properties (induced_drag_W, side_force_W, lift_W, induced_drag_coefficient_W, side_force_coefficient_W, and lift_coefficient_W) to Airplane.
• Added read-only properties (induced_drag_W, side_force_W, and lift_W) to Panel using existing slots.
• Centralized the VALID_SCALAR_TYPES vocabulary in _output_rendering.py and refactored get_scalars to query named panel properties.
• Updated scalar type validation in draw and animate, along with data assembly in plot_results_versus_time, to reference the centralized constants and named properties.
• Documented named wind axes force components and their sign conventions in docs/AXES_POINTS_AND_FRAMES.md.

Dependency Updates

None.

Change Magnitude

Minor: Small change such as a bug fix, small enhancement, or documentation update.

Checklist (check each item when completed or not applicable)

• I am familiar with the current contribution guidelines.
• PR description links all relevant issues and follows this template.
• My branch is based on main and is up to date with the upstream main branch.
• All calculations use S.I. units.
• Code is formatted with black (line length = 88).
• Code is well documented with block comments where appropriate.
• Any external code, algorithms, or equations used have been cited in comments or docstrings.
• All new modules, classes, functions, and methods have docstrings in reStructuredText format, and are formatted using docformatter (--in-place --black). See the style guide for type hints and docstrings for more details.
• All new classes, functions, and methods in the pterasoftware package use type hints. See the style guide for type hints and docstrings for more details.
• If any major functionality was added or significantly changed, I have added or updated tests in the tests package.
• Code locally passes all tests in the tests package.
• This PR passes the ReadTheDocs build check (this runs automatically with the other workflows).
• This PR passes the ascii-only, pre-commit-hooks, and zizmor GitHub actions.
• This PR passes the lint job of the CI GitHub action.
• This PR passes the test jobs of the CI GitHub action.

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[codecov]

Codecov Report

❌ Patch coverage is 82.81250% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.44%. Comparing base (ae76bdb) to head (4aca08b).

Files with missing lines	Patch %	Lines
pterasoftware/geometry/airplane.py	80.00%	6 Missing ⚠️
pterasoftware/_panel.py	80.00%	3 Missing ⚠️
pterasoftware/output.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
- Coverage   94.53%   94.44%   -0.09%     
==========================================
  Files          47       47              
  Lines        9209     9260      +51     
==========================================
+ Hits         8706     8746      +40     
- Misses        503      514      +11     

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