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/hooks.py

@@ -0,0 +1,22 @@
+import logging
+
+from odoo.tools import sql
+
+logger = logging.getLogger(__name__)
+
+
+def pre_init_hook(cr):
+    """Prepare new payment_mode fields.
+
+    Add columns to avoid Memory error on an existing Odoo instance
+    with lots of data.
+
+    The payment_mode_id fields are introduced by this module and computed only
+    from each other or the also newly introduced supplier_payment_mode_id and
+    customer_payment_mode_id on res.partner, so they can stay NULL, nothing
+    to compute.
+    """
+    if not sql.column_exists(cr, "account_move", "payment_mode_id"):
+        sql.create_column(cr, "account_move", "payment_mode_id", "int4")
+    if not sql.column_exists(cr, "account_move_line", "payment_mode_id"):
+        sql.create_column(cr, "account_move_line", "payment_mode_id", "int4")