feat(fusion_clock): NFC kiosk employee search endpoint

Add /fusion_clock/kiosk/nfc/employee_search that delegates to the
existing kiosk_search method, avoiding logic duplication. Adds
TestEmployeeSearch HttpCase (33 tests total, all passing).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_clock/controllers/clock_nfc_kiosk.py

@@ -237,3 +237,9 @@ class FusionClockNfcKiosk(http.Controller):
                 'message': f'{employee.name} clocked out',
                 'net_hours_today': round(attendance.x_fclk_net_hours or 0, 2),
             }
+
+    @http.route('/fusion_clock/kiosk/nfc/employee_search', type='jsonrpc', auth='user', methods=['POST'])
+    def nfc_employee_search(self, query='', **kw):
+        """Delegate to the existing kiosk search to avoid duplication."""
+        from .clock_kiosk import FusionClockKiosk
+        return FusionClockKiosk().kiosk_search(query=query)