feat(fusion_clock): add x_fclk_nfc_card_uid to hr.employee

Adds the NFC card UID field (Char, unique, manager-only) that the kiosk
will use to identify employees by card tap. Includes the tests package
with three post-install tests covering write, uniqueness, and nullable
multi-row behaviour.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fusion_clock/tests/__init__.py

@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+
+from . import test_nfc_models

fusion_clock/tests/test_nfc_models.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+
+from odoo.tests.common import TransactionCase, tagged
+from odoo.exceptions import ValidationError
+from psycopg2 import IntegrityError
+from odoo.tools.misc import mute_logger
+
+
+@tagged('-at_install', 'post_install', 'fusion_clock')
+class TestNfcModels(TransactionCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.Employee = cls.env['hr.employee']
+        cls.alice = cls.Employee.create({'name': 'Alice NFC', 'x_fclk_enable_clock': True})
+        cls.bob = cls.Employee.create({'name': 'Bob NFC', 'x_fclk_enable_clock': True})
+
+    def test_card_uid_is_writable(self):
+        self.alice.x_fclk_nfc_card_uid = '04:A2:B5:62:C1:80'
+        self.assertEqual(self.alice.x_fclk_nfc_card_uid, '04:A2:B5:62:C1:80')
+
+    def test_card_uid_is_unique_when_set(self):
+        self.alice.x_fclk_nfc_card_uid = '04:A2:B5:62:C1:80'
+        with self.assertRaises(IntegrityError), mute_logger('odoo.sql_db'):
+            with self.env.cr.savepoint():
+                self.bob.x_fclk_nfc_card_uid = '04:A2:B5:62:C1:80'
+                self.bob.flush_recordset(['x_fclk_nfc_card_uid'])
+
+    def test_card_uid_can_be_null_for_multiple_employees(self):
+        self.alice.x_fclk_nfc_card_uid = False
+        self.bob.x_fclk_nfc_card_uid = False
+        self.assertFalse(self.alice.x_fclk_nfc_card_uid)
+        self.assertFalse(self.bob.x_fclk_nfc_card_uid)