fix(v1.2.4): OptionsFlowHandler 500 error on reconfiguration

[Copilot]

Reconfiguring the integration fails with a 500 Internal Server Error because newer HA versions made config_entry a read-only property on OptionsFlow, breaking the manual assignment in OptionsFlowHandler.__init__.

Changes

• config_flow.py: Remove OptionsFlowHandler.__init__ entirely — HA automatically injects config_entry. Update async_get_options_flow to return OptionsFlowHandler() with no arguments.
• manifest.json: Bump version to 1.2.4.
• CHANGELOG.md: Add v1.2.4 entry.

# Before — raises AttributeError on newer HA
class OptionsFlowHandler(config_entries.OptionsFlow):
    def __init__(self, config_entry: config_entries.ConfigEntry) -> None:
        self.config_entry = config_entry  # ❌ no setter

# After — framework injects config_entry automatically
class OptionsFlowHandler(config_entries.OptionsFlow):
    async def async_step_init(self, user_input=None):
        ...  # self.config_entry is available via the base class property

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