fix: auto-create circuit for hems

[naltatis]

fixes #25949

create single lpc circuit if hems but no load management is configured.

[sourcery-ai]

Hey - I've left some high level feedback:

• The hard-coded circuit ID and name "lpc" are duplicated in GetOrCreateCircuit("lpc", "lpc"); consider introducing a shared constant or reusing existing configuration to avoid magic strings and keep this in sync with other circuit-related logic.
• Auto-creating a circuit inside configureHEMS adds a side effect to a function that otherwise just configures HEMS; consider moving this behavior to a more central initialization path or clearly documenting that HEMS configuration may mutate circuit state.
• Using log.INFO for the auto-create message might be noisy in normal operation; consider downgrading to a more verbose log level or making it conditional so it only appears when the auto-creation actually changes state.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The hard-coded circuit ID and name "lpc" are duplicated in `GetOrCreateCircuit("lpc", "lpc")`; consider introducing a shared constant or reusing existing configuration to avoid magic strings and keep this in sync with other circuit-related logic.
- Auto-creating a circuit inside `configureHEMS` adds a side effect to a function that otherwise just configures HEMS; consider moving this behavior to a more central initialization path or clearly documenting that HEMS configuration may mutate circuit state.
- Using `log.INFO` for the auto-create message might be noisy in normal operation; consider downgrading to a more verbose log level or making it conditional so it only appears when the auto-creation actually changes state.

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