Add WiesiDeluxe/ha-harvia-sauna

[WiesiDeluxe]

WiesiDeluxe/ha-harvia-sauna

Custom Home Assistant integration for Harvia sauna heaters with Xenio WiFi control panels.

Features

• Real-time WebSocket push updates (cloud_push)
• Climate entity, 8 switches, 19 sensors, 3 binary sensors, 3 number controls (34 entities total)
• Session tracking (duration, max temp, daily count)
• Energy monitoring (kWh, persistent, Energy Dashboard compatible)
• Custom service harvia_sauna.set_session
• HA events for session start/end
• Diagnostics export
• Config flow with auto-detection, reauth, and reconfigure support
• 9 translations (EN, DE, FI, IT, FR, SV, ES, JA, ET)

Checklist

• Config flow
• manifest.json with version
• hacs.json not required (standard structure)
• README with documentation
• GitHub releases with semantic versioning
• Repository description and topics set

[hacs-bot]

Limit your PR to a single repository change. This PR changes multiple repositories to the same file. Please create separate PRs for each repository.