feat: auto-sync worker for SimpleFIN bank sync
New:
services/bankSyncWorker.js — interval-based worker running every 4h (configurable via SIMPLEFIN_SYNC_INTERVAL_HOURS)
- Checks bank sync enabled, fetches oldest-synced sources, skips <1h old
- Staggers syncs 3s apart, writes last_error on failure, timer.unref() for clean shutdown
Modified:
server.js — starts worker inside app.listen callback
routes/admin.js — GET bank-sync-config includes worker status (running, interval, last/next run)
client/components/admin/BankSyncAdminCard.jsx — shows auto-sync worker status panel when enabled
.env.example — SIMPLEFIN_SYNC_INTERVAL_HOURS
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