Adds new integration [wizz666/homeassistant-systembolaget]

[wizz666]

Checklist

• I have read the HACS publishing documentation
• The repository is public
• The integration has a LICENSE file (MIT)
• Releases are published
• HACS action passes
• Hassfest passes

Links

• Release: https://github.com/wizz666/homeassistant-systembolaget/releases/tag/untagged-1257dc5e072a974992e8
• HACS Action run: https://github.com/wizz666/homeassistant-systembolaget/actions/runs/26007088060/job/76440422724
• Hassfest run: https://github.com/wizz666/homeassistant-systembolaget/actions/runs/26007088060/job/76440422731

About

Systembolaget integration for Home Assistant — tracks product availability, new arrivals and store status for Sweden's Systembolaget.

Rebased on current master (replaces #6580 which had a merge conflict).

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