Pre-API draft

🚀 Features
-11 power sensors tracking flows between Solar, Battery, Grid, and House in kW.
-13 energy sensors (kWh) utilizing Riemann sum integration for accurate long-term statistics.
-Automated calculation of "Total Battery Charge" and "Total Grid Export" by summing multiple power sources before integration.
-Coordinator-Driven Architecture: Uses a centralized DataUpdateCoordinator to poll the API once per interval, regardless of the number of sensors, protecting your API limits.
-Persistent Statistics: Energy sensors inherit from RestoreEntity, ensuring your data survives Home Assistant restarts.
-Dynamic Configuration: Adjustable scan intervals (minimum 120s) with support for Options Flow (change settings without reinstalling).
-Energy Dashboard Ready: All energy sensors are pre-configured with the correct device_class and state_class for immediate use in the HA Energy Dashboard.
-Localized: Full support for English and Finnish (Suomi) languages.
-Visuals: Custom Material Design Icons (MDI) mapped to specific energy flows.