feat(fusion_accounting_core): shared-field-ownership for cron_last_check

Declare account.bank.statement.line.cron_last_check on
fusion_accounting_core so the column survives Enterprise
account_accountant uninstall. Mirrors the existing pattern used
for account.move and account.reconcile.model shared fields.

- Add models/account_bank_statement_line.py declaring cron_last_check
  as fields.Datetime(copy=False)
- Wire model into models/__init__.py
- Add post_install regression test verifying field presence and type
- Bump manifest 19.0.1.0.0 -> 19.0.1.0.1

Made-with: Cursor

fusion_accounting_core/models/__init__.py

@@ -1,3 +1,4 @@
 from . import ir_module_module
 from . import account_move
 from . import account_reconcile_model
+from . import account_bank_statement_line

fusion_accounting_core/models/account_bank_statement_line.py

@@ -0,0 +1,15 @@
+"""Shared-field-ownership for account.bank.statement.line.
+
+Enterprise's account_accountant adds cron_last_check (timestamp of the last
+auto-reconcile cron run for the line). By declaring it here with the same
+schema, fusion_accounting_core becomes a co-owner so the column persists
+when account_accountant uninstalls.
+"""
+
+from odoo import fields, models
+
+
+class AccountBankStatementLine(models.Model):
+    _inherit = "account.bank.statement.line"
+
+    cron_last_check = fields.Datetime(copy=False)