Add UI-based OptionsFlow so Smart Climate requires no YAML configuration

[Copilot]

The integration lacked a way to change settings post-setup through the UI — users either had to edit YAML or were stuck with the initial values.

Changes

• config_flow.py — Added SmartClimateOptionsFlow and registered it via async_get_options_flow. Exposes all runtime-tunable settings (temperatures, away delay, interruptibility, override mode/duration) under Settings → Integrations → Smart Climate → Configure.

• climate.py — Settings now read from entry.options merged over entry.data, so options flow changes take effect after reload.

• __init__.py — Registers an update listener that reloads the config entry when options change.

• Translations (strings.json, en.json, nl.json) — Added strings for the new options.init step and the previously untranslated config.reconfigure step (Dutch included).

UI entry points after this change

Action	Path
Initial setup	Add Integration → Smart Climate
Change entity references	Smart Climate → ⋮ → Reconfigure
Change temperatures / override settings	Smart Climate → Configure

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Config </issue_title>
<issue_description>Er moet in kaart gebracht worden hoe nu de integratie moet worden geconfigureerd en indien mogelijk moet hij via een ui worden toegevoegd zodat de gebruiker helemaal geen yaml hoeft te bewerken.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Config  #28

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