v0.5.0-beta — integration overhaul

Beta release of the integration overhaul (PR #113). Pre-release — enable "show beta versions" in HACS to install.

Highlights

• Bug fixes: current_power is now POWER/Watts; invalid saved_co2 device class removed; economy_of_last_30 fixed; valid 2-tuple device identifiers; notifier service calls awaited (critical alerts/dismiss now fire); per-entry unique_id; monetary sensors use the account currency instead of $.
• Refactor: ~25 sensor classes (1266 lines) replaced by a description-driven design (~155 lines).
• New data: yearly energy (records API); per-inverter temperature/power/energy/status/serial/last-record; per-datalogger firmware/MAC/RSSI/last-record.
• Multi-inverter and microinverter support (parallel /inverters + /microinverters fetch, defensive merge — credit @murilobast, #104).
• Automatic currency from account preferences (closes #25).
• Robustness/UX: token caching, configurable scan interval (options flow), reauth flow, diagnostics with redaction, enriched manifest.

Notes

• Built from the PR #113 branch (not yet merged into main).
• Tests: 23 pytest cases green; ruff, hassfest and HACS validation pass.
• Not yet verified on a live Home Assistant instance — that's what this beta is for. Please report issues on the tracker.