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'.
