Add oca-purchase submodule with 96 purchase modules moved from oca-workflow-process

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Co-Authored-By: Claude <noreply@anthropic.com>

odoo-bringout-oca-purchase-workflow-purchase_discount/purchase_discount/readme/CONTRIBUTORS.rst

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+* OpenERP S.A.
+* Ignacio Ibeas <ignacio@acysos.com>
+* Pedro M. Baeza <pedro.baeza@tecnativa.com>
+* Jonathan Nemry <jonathan.nemry@acsone.eu>
+* Sylvain LE GAL (https://twitter.com/legalsylvain)
+* Stefan Rijnhart <stefan@opener.amsterdam>
+* `Tecnativa <https://www.tecnativa.com>`_:
+
+  * Pedro M. Baeza
+  * Vicent Cubells <vicent.cubells@tecnativa.com>
+
+* Sudhir Arya <sudhir@erpharbor.com>
+* Lorenzo Battistini <https://github.com/eLBati>
+* Luisa Miguéns <luisa.miguens@solvos.es>
+* Vishnu Vanneri <vanneri.odoodev@gmail.com>
+* Moaad Bourhim <moaad.bourhim@gmail.com>

odoo-bringout-oca-purchase-workflow-purchase_discount/purchase_discount/readme/DESCRIPTION.rst

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+This module allows to define a discount per line in the purchase orders. This
+discount can be also negative, interpreting it as an increment.
+
+It also modifies the purchase order report to include the discount field in it.
+
+This module allows to input a discount in the supplier info form, and propagate
+it to purchase order lines:
+
+* The discount appears explicitly in purchase orders instead of being directly
+  discounted in price.
+* You can set prices and discounts on the same screen.
+
+.. image:: ../static/description/product_supplierinfo_form.png
+
+
+* A new field default_supplierinfo_discount is added on res.partner model.
+  This value will be used as the default one, on each supplierinfo of that
+  supplier.
+
+.. image:: ../static/description/res_partner_company_form.png
+
+
+Note: this setting is a new 'company' setting, unavailable for related
+partners, as accounting-related Settings.
+
+.. image:: ../static/description/res_partner_individual_form.png

odoo-bringout-oca-purchase-workflow-purchase_discount/purchase_discount/readme/ROADMAP.rst

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+With this module, the *price_unit* field of purchase order line stores the gross price instead of the net price, which is a change in the meaning of
+this field. So this module breaks all the other modules that use the *price_unit* field with it's native meaning.

odoo-bringout-oca-purchase-workflow-purchase_discount/purchase_discount/readme/USAGE.rst

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+Go to **Purchase > Products**, open one product, and edit or add a record on
+the **Vendors** section of the **Purchase** tab. You will see in the prices
+section in the down part a new column called **Discount (%)**. You can enter
+here the desired discount for that quantity.
+
+When you make a purchase order for that supplier and that product, discount
+will be put automatically.