Restructure: move packages from packages/ subdirectory to root

Flattened directory structure by moving payment packages from redundant
packages/ subdirectory to the root level of oca-payment repository.

Changes:
- Moved odoo-bringout-oca-payment-* from packages/ to root
- Updated CLAUDE.md to reflect new flat structure
- Removed redundant packages/ directory

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

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

odoo-bringout-oca-payment-payment_partner/account_payment_partner/models/res_partner.py

@@ -0,0 +1,32 @@
+# Copyright 2014 Akretion - Alexis de Lattre <alexis.delattre@akretion.com>
+# Copyright 2014 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, fields, models
+
+
+class ResPartner(models.Model):
+    _inherit = "res.partner"
+
+    supplier_payment_mode_id = fields.Many2one(
+        comodel_name="account.payment.mode",
+        company_dependent=True,
+        check_company=True,
+        domain="[('payment_type', '=', 'outbound'),"
+        "('company_id', '=', current_company_id)]",
+        help="Select the default payment mode for this supplier.",
+    )
+    customer_payment_mode_id = fields.Many2one(
+        comodel_name="account.payment.mode",
+        company_dependent=True,
+        check_company=True,
+        domain="[('payment_type', '=', 'inbound'),"
+        "('company_id', '=', current_company_id)]",
+        help="Select the default payment mode for this customer.",
+    )
+
+    @api.model
+    def _commercial_fields(self):
+        res = super()._commercial_fields()
+        res += ["supplier_payment_mode_id", "customer_payment_mode_id"]
+        return res