- Scope MeasurementType lookup by sensor and assign station
- Convert payload values safely (no BigDecimal ClassCastException)
- Handle MQTT callback errors without crashing the service
- Apply MQTT config flags (automaticReconnect, cleanSession, timeout) as Bean
- Externalize MQTT password to MQTT_PASSWORD environment variable
- Bump org.json to 20260814, drop unused joda-time
- Add systemd deploy files and .gitignore entries