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/hooks.py

@@ -0,0 +1,16 @@
+from odoo.tools import sql
+
+
+def pre_init_hook(cr):
+    """Prepare new partner_bank_id computed field.
+
+    Add column to avoid MemoryError on an existing Odoo instance
+    with lots of data.
+
+    partner_bank_id on account.move.line requires payment_order_ok to be True
+    which it won't be as it's newly introduced - nothing to compute.
+    (see AccountMoveLine._compute_partner_bank_id() in models/account_move_line.py
+    and AccountMove._compute_payment_order_ok() in models/account_move.py)
+    """
+    if not sql.column_exists(cr, "account_move_line", "partner_bank_id"):
+        sql.create_column(cr, "account_move_line", "partner_bank_id", "int4")