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_mode/account_payment_mode/migrations/16.0.2.0.0/post-migrate.py

@@ -0,0 +1,11 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    """Migrate note field from Text to Html"""
+    openupgrade.convert_field_to_html(
+        env.cr, "account_payment_mode", "note", "note", False, True
+    )