feat(13-01): seed pax8-daily sync schedule via migration 096

- Idempotent INSERT ... WHERE NOT EXISTS seed of the pax8-daily row
  (cron 0 4 * * *, is_enabled false), mirroring migration 089's style
- Covers existing installs since createDefaultSchedules() only seeds
  a virgin sync_schedules table
- Applied to running dev DB and verified idempotent (second run = 0 rows)

migrations/096_pax8_daily_schedule.sql

@@ -0,0 +1,13 @@
+-- Migration 096: Seed the pax8-daily sync schedule.
+--
+-- The sync_scheduler.createDefaultSchedules() path only seeds defaults on a
+-- virgin sync_schedules table; this migration covers existing installs.
+-- sync_schedules has no unique constraint on name, so guard with NOT EXISTS
+-- (same pattern as migration 089's appgate-sessions/appgate-daily seeds).
+
+INSERT INTO sync_schedules (id, name, description, cron_expression, sync_type, is_enabled)
+SELECT 'pax8-daily',
+       'PAX8 Daily Sync',
+       'Full PAX8 sync — companies, subscriptions, products, orders, and company matching, daily at 4 AM.',
+       '0 4 * * *', 'pax8-daily', false
+ WHERE NOT EXISTS (SELECT 1 FROM sync_schedules WHERE name = 'PAX8 Daily Sync');