v1.1.0 — work-mode slugs, fault visibility, diagnostics

Breaking for automations: Work Mode option values are now stable slugs (self_consumption, battery_priority, grid_priority, time_period, power_keeping) instead of display labels, with friendly labels moved to translations. These match the legacy hinen_power integration's slugs and device values, so automations written against it work unchanged. Entity IDs are unchanged.

Added

• Inverter fault visibility: sensor.<device>_alert_status (normal/alarm/error) and binary_sensor.<device>_problem — connectivity alone can't see a faulted-but-reachable inverter.
• Diagnostics download, with OAuth tokens, client id/secret, serial and device id redacted.
• README configuration-parameters reference, Troubleshooting and Removal sections.

Fixed

• An unreachable device logged an error every 60s poll; now logged once with a recovery log.

See CHANGELOG.md.

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