Make public_settings and last_update_time nullable in API responses

[Copilot]

The SolarEdge API (as of March 2026) now returns null for publicSettings in site details and lastUpdateTime in site overview responses, causing deserialization failures.

Changes

• Details.public_settings: PublicSettings → Option<PublicSettings>
• Overview.last_update_time: NaiveDateTime (with DateTimeSerde) → Option<NaiveDateTime> (with DateTimeSerdeOpt)

Original prompt

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This section details on the original issue you should resolve

<issue_title>API Changes</issue_title>
<issue_description>In march 2026 solaredge changed the API. I found several issues.

https://knowledge-center.solaredge.com/sites/kc/files/se_monitoring_api.pdf

• version_current() and maybe others were removed
• public_settings in site details is null in my case (needs to be Option<>)

This is what I found so far. There are maybe more issues.

In the response from solaredge the peakPower is always 0.0 and the lastUpdateTime is null. I couldn't figure out why this is.

Kind regards</issue_description>

<agent_instructions>Take a look at the reported issues and adjust the API accordingly if necessary</agent_instructions>

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

@twistedfall The missing functions were removed in the `v0.9.0`, I'll take a look at the other inconsistencies, thanks for the report!

• Fixes API Changes #9

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