build: configurar herramientas de verificación OCA

- Instalar pre-commit con 25 hooks configurados
- Configurar black 26.1.0 para formateo de código Python
- Configurar isort 7.0.0 para ordenación de imports
- Configurar flake8 7.3.0 con flake8-bugbear
- Configurar pylint 3.1.1 con pylint-odoo 9.1.2
- Añadir autoflake y pyupgrade para mejoras automáticas
- Configurar prettier para formateo de XML/JSON/YAML
- Crear .editorconfig para consistencia de editor
- Crear Makefile con comandos útiles
- Crear check_addon.sh para verificación rápida de addons
- Actualizar configuración de VS Code con extensiones recomendadas
- Añadir documentación completa de uso
- Aplicar formateo automático a archivos existentes
- Deshabilitar setuptools-odoo (no soporta Odoo 18.0 aún)
- Deshabilitar fix-encoding-pragma (obsoleto, usar pyupgrade)

purchase_triple_discount/readme/CONTRIBUTORS.md

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+- [Tecnativa](https://www.tecnativa.com):
+
+  > - David Vidal
+  > - Pedro M. Baeza
+
+- Sylvain LE GAL (<https://twitter.com/legalsylvain>)
+
+- [ForgeFlow S.L.](https://www.forgeflow.com):
+  - Christopher Ormaza \<<chris.ormaza@forgeflow.com>\>

purchase_triple_discount/readme/DESCRIPTION.md

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+This module allows to have three successive discounts on every purchase
+order line.

purchase_triple_discount/readme/USAGE.md

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+Create a new purchase order and add discounts in any of the three
+discount fields given. They go in order of precedence so discount 2 will
+be calculated over discount 1 and discount 3 over the result of discount
+2. For example, let's divide by two on every discount:
+
+Unit price: 600.00 -\>
+
+> - Disc. 1 = 50% -\> Amount = 300.00
+> - Disc. 2 = 50% -\> Amount = 150.00
+> - Disc. 3 = 50% -\> Amount = 75.00
+
+You can also use negative values to charge instead of discount:
+
+Unit price: 600.00 -\>
+
+> - Disc. 1 = 50% -\> Amount = 300.00
+> - Disc. 2 = -5% -\> Amount = 315.00
+
+- When the purchase order is validated, the discounts will be added to
+  the corresponding vendor pricelist.
+- Vendor pricelists can be edited as well with their corresponding new
+  second and third discounts.
+- A default second or third discount can be set in every vendor *Sale &
+  Purchases* tab.