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_margin/pos_margin/readme/CONFIGURE.rst

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+* If you want to disable the display of the margin, in the front-office UI, you can
+  uncheck the check box in the `res.config.settings` shop form:
+
+.. figure:: ../static/description/pos_config_setting.png

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

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+* Sylvain LE GAL (https://twitter.com/legalsylvain)
+* Wolfgang Pichler
+* Murtaza Mithaiwala (https://twitter.com/MurtazaMithaiw4)
+* Dhara Solanki <dhara.solanki@initos.com>
+* Juan Carlos Bonilla <juancarlos.bonilla@factorlibre.com>

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

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+This module shows margins in PoS frontend during an order creation.

odoo-bringout-oca-pos-pos_margin/pos_margin/readme/HISTORY.rst

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+16.0.1.0.0
+~~~~~~~~~~
+
+* Migrate to V16.0
+* Remove ``pos.order`` and ``pos.order.line`` funcionality from V14.0.
+  It's already done by V16.0.
+* Remove tests.
+* Create a ``res.config.settings`` field `pos_iface_display_margin`
+  to display margins in PoS frontend.
+
+14.0.1.0.0
+~~~~~~~~~~
+
+* Migrate to V14.0
+
+13.0.1.0.0
+~~~~~~~~~~
+
+* Migrate to V13.0
+* Reuse ``sale_margin`` computation to handle multi currency context.
+* Correct computation of margin, if a module that adds ``uom_id`` on
+  ``pos.order.line`` is installed.
+* Add test

odoo-bringout-oca-pos-pos_margin/pos_margin/readme/ROADMAP.rst

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+This dependency can be removed, when Odoo Core will be correctly refactored,
+moving this ``@api.model`` function in a more generic module (``account``
+for exemple).