Move all OCA POS modules from oca-technical to dedicated oca-pos submodule

Reorganized 74 POS-related modules for better structure:
- Moved all odoo-bringout-oca-pos-* packages from packages/oca-technical/
- Now organized in dedicated packages/oca-pos/ submodule
- Includes payment, receipt, loyalty, order, product, and partner modules
- Maintains all module functionality while improving project organization

This creates a cleaner separation between general technical modules
and Point of Sale specific functionality.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

odoo-bringout-oca-pos-pos_membership/pos_membership/readme/CONTRIBUTORS.rst

@@ -0,0 +1 @@
+* Sylvain LE GAL (https://twitter.com/legalsylvain)

odoo-bringout-oca-pos-pos_membership/pos_membership/readme/CREDITS.rst

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+The development of this module has been financially supported by:
+
+* UGESS, Union Nationale des Groupements des épiceries Sociales et Solidaires (https://ugess.org/)

odoo-bringout-oca-pos-pos_membership/pos_membership/readme/DESCRIPTION.rst

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+This module extends the functionality of point of sale module, to
+add informations related to Odoo ``membership`` module.
+
+For instance :
+
+- It displays the field 'Current Membership Status' of the partners in the
+  point of sale screen. (partner list and partner form view)
+
+**Partner List View**
+
+.. figure:: ../static/description/pos_ui_partner_tree.png
+
+**Partner Form View**
+.. figure:: ../static/description/pos_ui_partner_form.png
+
+- it raises an error, if cashier try to sell a membership product,
+  without having selected the 'Invoice' option.
+
+.. figure:: ../static/description/pos_warning_sell_membership_product.png