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)

account_invoice_triple_discount/README.rst

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+.. image:: https://odoo-community.org/readme-banner-image
+   :target: https://odoo-community.org/get-involved?utm_source=readme
+   :alt: Odoo Community Association
+
+===============================
+Account Invoice Triple Discount
+===============================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:96fbed1626bb94b34b29d3287cbf750e394cae6f90526ddba1450a75f4c45b49
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/license-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Faccount--invoicing-lightgray.png?logo=github
+    :target: https://github.com/OCA/account-invoicing/tree/18.0/account_invoice_triple_discount
+    :alt: OCA/account-invoicing
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/account-invoicing-18-0/account-invoicing-18-0-account_invoice_triple_discount
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runboat-Try%20me-875A7B.png
+    :target: https://runboat.odoo-community.org/builds?repo=OCA/account-invoicing&target_branch=18.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+This module allows to have three successive discounts on each invoice
+line.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+Create a new invoice 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
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/account-invoicing/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us to smash it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/account-invoicing/issues/new?body=module:%20account_invoice_triple_discount%0Aversion:%2018.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+-------
+
+* QubiQ
+* Tecnativa
+* GRAP
+
+Contributors
+------------
+
+- David Vidal <david.vidal@tecnativa.com>
+- Pedro M. Baeza <pedro.baeza@tecnativa.com>
+- Nikul Chaudhary <nikulchaudhary2112@gmail.com>
+- `Aion Tech <https://aiontech.company/>`__:
+
+  - Simone Rubino <simone.rubino@aion-tech.it>
+
+- Laurent Mignon <laurent.mignon@acsone.eu>
+- Akim Juillerat <akim.juillerat@camptocamp.com>
+
+Maintainers
+-----------
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+This module is part of the `OCA/account-invoicing <https://github.com/OCA/account-invoicing/tree/18.0/account_invoice_triple_discount>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.