[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/USAGE.rst

@@ -0,0 +1,46 @@
+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