feat(fusion_plating_shopfloor): station roster + idle override + tablet config defaults (P6.1.6)

Adds two fields to fusion.plating.shopfloor.station:
- x_fc_authorised_user_ids (Many2many → res.users): restricts the
  tablet lock-screen tile grid to a specific roster per station.
  Empty = all operator-group users shown.
- x_fc_idle_lock_minutes (Integer, nullable): per-station override
  for the auto-lock idle threshold; null = use system parameter.

Plus data/fp_tablet_config_data.xml registers four ir.config_parameter
defaults (noupdate=1 — manager can override via Settings → Technical
→ Parameters):
  fp.shopfloor.tablet_idle_lock_minutes = 5
  fp.shopfloor.tablet_pin_fail_threshold = 5
  fp.shopfloor.tablet_pin_fail_lockout_minutes = 5
  fp.shopfloor.tablet_warn_seconds_before_lock = 30

Form view surfaces both new fields in a dedicated 'Tablet PIN Gate'
group.

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

fusion_plating/fusion_plating_shopfloor/models/fp_shopfloor_station.py

@@ -73,6 +73,26 @@ class FpShopfloorStation(models.Model):
         string='Notes',
     )
 
+    # Phase 6 tablet PIN gate — per-station roster + idle override.
+    x_fc_authorised_user_ids = fields.Many2many(
+        'res.users',
+        relation='fp_shopfloor_station_authorised_user_rel',
+        column1='station_id',
+        column2='user_id',
+        string='Authorised Operators',
+        help='If set, the tablet lock screen only shows tiles for these '
+             'users. Empty = all operator-group users are shown. Use to '
+             'restrict a tablet at a specialised station (e.g. EN Plating) '
+             'to techs trained on that station.',
+    )
+    x_fc_idle_lock_minutes = fields.Integer(
+        string='Idle Lock (minutes)',
+        help='Per-station override for the auto-lock idle threshold. '
+             'Leave blank to use the global default '
+             '(ir.config_parameter fp.shopfloor.tablet_idle_lock_minutes, '
+             'default 5).',
+    )
+
     _sql_constraints = [
         (
             'fp_shopfloor_station_code_uniq',