refactor: eliminate non-null assertions in 8 files (31 of 53 total)

refactor: eliminate non-null assertions in 8 files (31 of 53 total)

- AutomaticTransactionGenerator: extract connector status variables with
  null guards, use optional chaining for stationInfo and ATG config
- ChargingStation: replace stationInfo! with null guards and ?./?? defaults
- Helpers: replace stationInfo!.maximumPower! with ?./?? defaults
- IdTagsCache: replace stationInfo!.hashId with optional chaining
- ChargingStationWorkerBroadcastChannel: replace stationInfo!.hashId
- OCPP16IncomingRequestService: wrap firmware/diagnostics status in
  null guards, replace resetTime!/configurationKey! with safe access
- UIServerFactory: replace options!.host! with optional chaining
- Configuration: replace getConfigurationData()! with null guards