feat(fusion_accounting_core): add _fusion_is_enterprise_accounting_installed helper

Made-with: Cursor

fusion_accounting_core/models/__init__.py

@@ -1 +1 @@
-# Models populated in Tasks 8-12 (shared-field-ownership, helpers)
+from . import ir_module_module

fusion_accounting_core/models/ir_module_module.py

@@ -0,0 +1,32 @@
+from odoo import api, models
+
+
+# Modules considered "Odoo Enterprise accounting" for the purpose of feature gating.
+# A client is "on Enterprise" if any of these are installed; fusion_accounting_*
+# replacement modules will hide their menus when Enterprise is present (replace mode
+# vs. augment mode is configurable in Settings).
+ENTERPRISE_ACCOUNTING_MODULES = (
+    'account_accountant',
+    'account_reports',
+    'accountant',
+)
+
+
+class IrModuleModule(models.Model):
+    _inherit = "ir.module.module"
+
+    @api.model
+    def _fusion_is_enterprise_accounting_installed(self):
+        """True if any Odoo Enterprise accounting module is installed in this DB."""
+        return bool(self.sudo().search_count([
+            ('name', 'in', list(ENTERPRISE_ACCOUNTING_MODULES)),
+            ('state', '=', 'installed'),
+        ]))
+
+    @api.model
+    def _fusion_is_module_installed(self, module_name):
+        """True if a specific module is installed."""
+        return bool(self.sudo().search_count([
+            ('name', '=', module_name),
+            ('state', '=', 'installed'),
+        ]))