Add new save_syslog config option to collect events from the v2 UniFi
system-log API (/v2/api/site/{site}/system-log/all).
Changes:
- Add SaveSyslog field to Controller struct
- Add collectSyslog() function using v2 API
- Keep collectEvents() using v1 API for backwards compatibility
- Add RedactIPPII() helper for PII redaction
- Update lokiunifi to log raw JSON (parseable with Loki | json)
- Reduce indexed labels to low-cardinality fields only
- Add SystemLogEntry handler in lokiunifi report
Config: save_syslog (v2 API) vs save_events (v1 API)
Env: UP_UNIFI_DEFAULT_SAVE_SYSLOG=true