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_order/account_payment_order/data/payment_seq.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!--
+  Copyright 2015-2016 Akretion - Alexis de Lattre
+  Copyright 2019-2022 Tecnativa - Pedro M. Baeza
+  License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+-->
+<odoo noupdate="1">
+    <record id="account_payment_line_seq" model="ir.sequence">
+        <field name="name">Payment Line</field>
+        <field name="code">account.payment.line</field>
+        <field name="prefix">P</field>
+        <field name="padding">5</field>
+        <field name="company_id" eval="False" />
+    </record>
+    <record id="account_payment_order_seq" model="ir.sequence">
+        <field name="name">Payment Order</field>
+        <field name="code">account.payment.order</field>
+        <field name="prefix">PAY</field>
+        <field name="padding">4</field>
+        <field name="company_id" eval="False" />
+    </record>
+</odoo>