MOBILE ATTENDANCE SYNC FIX

The Flutter app posts queued attendance events to:
  /api/face_attendance/sync_attendance.php

The endpoint is authenticated with the mobile Bearer token and writes to:
  face_attendance_daily  (MORNING_IN / MORNING_OUT / LUNCH_IN / FINAL_OUT)
  attendance             (dashboard/report Present record, once per employee/date)
  face_mobile_attendance_events (idempotency by mobile event_id)

This makes retrying the same queued event safe. The Flutter app retries pending
network/server failures automatically while the app is running.

For the local PC server used by the current project:
  http://192.168.0.163/hrms_login/