Fix non-string manufacturer passed to device registry#217
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The manual config flow wrapped gateway metadata values in single-element tuples (a stray trailing comma), so `manufacturer` was stored as a tuple instead of a string. Home Assistant's device registry rejects non-string values and warns this will stop working in 2026.12.0. - config_flow.py: store the manual-entry values as plain strings/None. - __init__.py: defensively coerce list/tuple values to a string when building the gateway device entry, so existing config entries that already stored the tuple no longer trigger the warning.
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The manual config flow wrapped gateway metadata values in single-element tuples (a stray trailing comma), so
manufacturerwas stored as a tuple instead of a string. Home Assistant's device registry rejects non-string values and warns this will stop working in 2026.12.0.