v0.1-sprint0: Esqueleto completo AR-ShipDesign

- Estructura completa de carpetas (236 módulos stub + implementados)
- pyproject.toml, requirements, .gitignore, LICENSE (propietario)
- core/project.py: serialización .arsd (ZIP con JSON)
- core/units.py: conversiones SI <-> imperial completas
- ui/main_window.py: layout DELFTship-style con todos los paneles
  - Árbol de proyecto (dock izquierda)
  - Tabs de módulos (centro)
  - Panel de propiedades (dock derecha)
  - Panel hidrostáticos en vivo (inferior, fijo)
- ui/i18n: español e inglés
- ui/themes: tema claro y oscuro
- utils/logger.py, settings.py, validation.py
- data/liquids.json: 15 líquidos navales
- data/stability_criteria.json: IMO IS Code 2008, A.749(18), USCG
- tests/test_startup.py: 12 tests, todos PASSED
- Módulo scantling/ ISO 12215 (stubs Sprint 2.5)
- Módulo fabrication/molds/ para moldes FRP (stubs Sprint 13B)
- Módulo fabrication/ para CNC plasma/router/laser (stubs Sprint 13)

pyproject.toml

@@ -0,0 +1,54 @@
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.backends.legacy:build"
+
+[project]
+name = "arshipdesign"
+version = "0.1.0"
+description = "Software profesional de diseño naval — AR-ShipDesign"
+authors = [{ name = "Álvaro Rodríguez" }]
+license = { file = "LICENSE.txt" }
+readme = "README.md"
+requires-python = ">=3.11"
+keywords = ["naval", "ship design", "hydrostatics", "stability", "CAD"]
+classifiers = [
+    "Development Status :: 2 - Pre-Alpha",
+    "Programming Language :: Python :: 3.11",
+    "Topic :: Scientific/Engineering",
+    "Operating System :: Microsoft :: Windows",
+]
+
+dependencies = [
+    "PySide6>=6.6.0",
+    "pyvista>=0.43.0",
+    "pyvistaqt>=0.11.0",
+    "pyqtgraph>=0.13.0",
+    "geomdl>=5.3.1",
+    "numpy>=1.26.0",
+    "scipy>=1.11.0",
+    "pandas>=2.1.0",
+    "openpyxl>=3.1.0",
+    "ezdxf>=1.1.0",
+    "trimesh>=4.0.0",
+    "reportlab>=4.0.0",
+    "shapely>=2.0.0",
+]
+
+[project.scripts]
+arshipdesign = "main:main"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["arshipdesign*"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = "-v --tb=short"
+
+[tool.mypy]
+python_version = "3.11"
+strict = false
+ignore_missing_imports = true