SMA hybrid: add battery mode 4 (holdcharge)

[frbehrens]

Implementation of #27906 for SMA hybrid inverter.

Tests:
I run this successfully. I use a custom external rule (OpenHAB/mqtt), that did set the batterymode to holdcharge until noon, where the feed-in price turned negative. The loading of battery was delayed as expected:

[sourcery-ai]

Hey - I've left some high level feedback:

• The new case: 4 block largely duplicates the structure of the other modes; consider factoring the common Modbus write sequence (with parameters for the few differing values) into a reusable template/helper to reduce repetition and potential drift between modes.
• The constant 2424 for CmpBMS.OpMod is a bit opaque; adding a named template variable or comment explaining what this mode value represents would make the configuration more maintainable and less error-prone for future changes.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new `case: 4` block largely duplicates the structure of the other modes; consider factoring the common Modbus write sequence (with parameters for the few differing values) into a reusable template/helper to reduce repetition and potential drift between modes.
- The constant `2424` for `CmpBMS.OpMod` is a bit opaque; adding a named template variable or comment explaining what this mode value represents would make the configuration more maintainable and less error-prone for future changes.

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[andig]

Thanks for building and testing this!

[MartinNumber1]

Hey, tolle Arbeit! ...Vorsichtig und höflich gefragt: Wäre es auch noch möglich Mode 4 für die SMA-Batteriewechselrichter (Sunny Boy Storage 3.7 - Modbus) zu adaptieren?

[andig]

Ist denn klar, welche Register dort zu verwenden sind?

[MartinNumber1]

Ist denn klar, welche Register dort zu verwenden sind?

Leider nein. 😏 Unwissenheit und Zeitmangel lassen es bei mir auch nicht zu dieses herauszufinden.. Grundsätzlich stehen die Register-Listen ja frei verfügbar auf der SMA-Homepage. Wobei es softwarebedingte Unterschiede gibt bei den Geräten, also gibt getrennte Versionen nach < BJ 2018 und > BJ 2018.
Hatte gehofft, dass vielleicht noch mehr Leute hier "Bedarf anmelden" und jemand es umzusetzen weiß, kann und möchte... 🙂