[DOC] Actualizar documentación a estándares OCA y preparar logo CriptoMart

- Renombrar README.md a README_DEV.md en todos los addons custom
- Crear README.rst siguiendo estructura OCA oficial
- Crear directorios readme/ con fragmentos .rst (DESCRIPTION, INSTALL, CONFIGURE, USAGE, CONTRIBUTORS, CREDITS)
- Actualizar créditos: Criptomart (autor) + Elika Bilbo (financiador)
- Actualizar __manifest__.py con maintainers correctos
- Crear estructura static/description/ para logo en 5 addons
- Agregar documentación de logo (LOGO_INSTRUCTIONS.md, install_logo.sh)
- Actualizar copilot-instructions.md con referencias a OCA_DOCUMENTATION.md
- Crear docs/OCA_DOCUMENTATION.md con guía completa de estructura
- Crear docs/RESUMEN_CAMBIOS_DOCUMENTACION.md con resumen detallado

Addons actualizados:
- website_sale_aplicoop
- product_sale_price_from_pricelist
- product_pricelist_total_margin
- product_price_category_supplier
- account_invoice_triple_discount_readonly

account_invoice_triple_discount_readonly/readme/CONFIGURE.rst

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+No additional configuration is required after installation. The module automatically:
+
+* Makes the total discount field readonly
+* Preserves individual discount values on save
+* Maintains backward compatibility with existing discounts

account_invoice_triple_discount_readonly/readme/CONTRIBUTORS.rst

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+* `Criptomart <https://criptomart.net>`_:
+
+  * Bug fix and implementation
+  * Override logic for write method

account_invoice_triple_discount_readonly/readme/CREDITS.rst

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+**Authors:**
+
+* Criptomart
+
+**Funding:**
+
+* Elika Bilbo
+
+**Other credits:**
+
+This module fixes a critical bug in the interaction between OCA's ``account_invoice_triple_discount`` and ``purchase_triple_discount`` modules, ensuring discount values are preserved correctly across all document types.

account_invoice_triple_discount_readonly/readme/DESCRIPTION.rst

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+This module fixes a bug in ``account_invoice_triple_discount`` when combined with ``purchase_triple_discount``.
+
+**Problem Solved:**
+
+In purchase orders, when configuring discounts in the ``discount2`` or ``discount3`` columns:
+
+* Upon saving, all discounts were accumulated in the ``discount1`` column
+* The ``discount2`` and ``discount3`` fields were reset to zero
+* This occurred because the original mixin's ``write`` method always reset these fields
+
+**Solution:**
+
+The module overrides the ``write`` method of ``triple.discount.mixin`` to:
+
+#. Detect if ``discount1``, ``discount2`` or ``discount3`` are being explicitly modified
+#. If there are explicit discounts, ignore the computed ``discount`` field
+#. If only the ``discount`` field comes, maintain legacy behavior
+#. Make the total ``discount`` field readonly in relevant views
+
+**Additional Features:**
+
+* Makes the ``discount`` field (total discount) **readonly** in:
+
+  * Partner form view (``res.partner``)
+  * Supplier info in product form (``product.supplierinfo``)
+  * Purchase order lines (``purchase.order.line``)
+  * Account move lines (``account.move.line``)
+  * Base mixin (``triple.discount.mixin``)
+
+* Forces users to work only with the ``discount1``, ``discount2`` and ``discount3`` columns
+* Avoids confusion between computed total and individual discounts

account_invoice_triple_discount_readonly/readme/INSTALL.rst

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+To install this module, you need to:
+
+#. Ensure dependencies are installed:
+
+   * account_invoice_triple_discount (OCA)
+   * purchase_triple_discount (OCA)
+
+#. Update the Apps list
+#. Search for "Account Invoice Triple Discount Readonly"
+#. Click Install

account_invoice_triple_discount_readonly/readme/USAGE.rst

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+After installation:
+
+**Working with Discounts:**
+
+#. The total discount field will be readonly and automatically calculated
+#. Always use ``discount1``, ``discount2``, and ``discount3`` fields to set discounts
+#. When saving, the individual discount values will be preserved correctly
+
+**Example:**
+
+::
+
+  Product: Widget
+  Price: 100.00€
+  Discount 1: 10%  → 90.00€
+  Discount 2: 5%   → 85.50€
+  Discount 3: 2%   → 83.79€
+
+  Total discount: 16.21% (displayed, readonly)
+
+**Before this module:**
+
+After saving, you would see:
+
+::
+
+  Discount 1: 16.21%  ❌ (accumulated)
+  Discount 2: 0%      ❌ (reset)
+  Discount 3: 0%      ❌ (reset)
+
+**After this module:**
+
+After saving, you correctly see:
+
+::
+
+  Discount 1: 10%  ✅
+  Discount 2: 5%   ✅
+  Discount 3: 2%   ✅
+  Total: 16.21% (readonly, calculated)
+
+**Important:**
+
+* Do not try to edit the total discount field (it's readonly)
+* Always work with the three individual discount columns
+* The total is recalculated automatically