fix(fusion_clock): NFC kiosk location domain + test isolation

Add domain filter on x_fclk_nfc_kiosk_location_id so the dropdown
only shows locations belonging to the current company in multi-company
setups. Replace shared-company mutation in test with a fresh company
to prevent cross-test state leakage.

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

fusion_clock/models/res_company.py

@@ -11,6 +11,7 @@ class ResCompany(models.Model):
     x_fclk_nfc_kiosk_location_id = fields.Many2one(
         'fusion.clock.location',
         string='NFC Kiosk Location',
+        domain="[('company_id', '=', id)]",
         help="Designates which fusion.clock.location is bound to the NFC kiosk "
              "for this company. Required when NFC kiosk is enabled.",
     )