feat(fusion_clock): settings UI for generation horizon + self-unassign; open-shift in backend views [C1]

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_clock/models/res_config_settings.py

@@ -245,6 +245,19 @@ class ResConfigSettings(models.TransientModel):
         help="Which clock location is bound to the NFC kiosk for this company. "
              "Required when the kiosk is enabled.",
     )
+    fclk_planning_generation_months = fields.Integer(
+        related='company_id.fclk_planning_generation_months',
+        readonly=False,
+        string='Schedule Generation Horizon (months)',
+        help="How many months ahead recurring shifts are pre-generated.",
+    )
+    fclk_self_unassign_days_before = fields.Integer(
+        related='company_id.fclk_self_unassign_days_before',
+        readonly=False,
+        string='Self-Unassign Cutoff (days before shift)',
+        help="Employees may release an open shift they claimed up to this many "
+             "days before it starts.",
+    )
     fclk_photo_retention_days = fields.Integer(
         string='Auto-Wipe Photos After (days)',
         config_parameter='fusion_clock.photo_retention_days',