Add missing strings.json file to fix config flow registration

[Copilot]

Home Assistant couldn't load the integration due to a missing strings.json file, resulting in "Invalid handler specified" error when attempting to add the integration via UI.

Changes

• Added custom_components/ble_adv_split/strings.json: Home Assistant requires this file at the component root to register config flows. Copied from existing translations/en.json.
• Fixed typo: Corrected "Minumum Duration" → "Minimum Duration" in both strings.json and translations/en.json.

Context

Home Assistant's config flow system validates against strings.json (base English translations) at the component root, separate from the translations/ directory used for localization. The integration had translations but was missing this registration file.

Original prompt

You recently did work to add split driver lights functionality, but I cannot add the integration to Home assistant

Config flow could not be loaded: {"message":"Invalid handler specified"}

This is the error I am getting.

Please investigate and fix the issue.

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