feat(fusion_clock): NFC card enrollment wizard + employee form field

Adds a tap-driven enrollment workflow so managers can pair NFC/RFID
cards to employees using a USB HID reader at their desk:

- New wizard model fusion.clock.nfc.enrollment.wizard with auto-focused
  Card UID field, employee picker, and reassignment warning if the
  card is already held by someone else.
- Two actions: 'Enroll Card' (single) and 'Enroll & Next' (bulk).
- Menu entry under Fusion Clock root, manager-gated.
- Exposes x_fclk_nfc_card_uid on the Employee form Clock Settings
  section (next to Kiosk PIN) so it can be inspected/edited directly.
- Bumps manifest to 19.0.3.1.0 for asset cache bust.

Wizard reuses FusionClockNfcKiosk._normalize_uid so stored format
matches what the kiosk /tap endpoint looks up later. Reassignment
clears the UID from the previous holder and logs both events to the
activity log under 'card_enrollment'.

fusion_clock/wizard/__init__.py

@@ -0,0 +1,5 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+
+from . import clock_nfc_enrollment_wizard