Improvements
- Localized entity names: all entities now use translation keys with English and German translations; friendly names follow your Home Assistant language (entity IDs are unchanged)
- Safer device discovery: DHCP discovery no longer creates duplicate flows for already-configured devices, and reconfiguring now verifies you are still talking to the same device
- Web UI link fixed for devices on non-standard ports and IPv6 hosts
- Internal cleanup: typed config entry, deduplicated device info/serial helpers, narrower error handling, removed dead code
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