Optimizer: configurable battery efficiency

[andig]

depends on evcc-io/optimizer#99
fixes #32038

Makes the battery charge/discharge efficiency used by the optimizer configurable instead of assuming 90% for every battery. Default stays 90%.

• new advanced efficiency parameter for battery meters, part of the shared battery params preset, hence available on all battery templates without touching a single device
• the parameter is handled while creating the meter and never reaches the device implementation since the device does not use it
• sent as the per-battery eta_c/eta_d added by feat: per-battery charge/discharge efficiency optimizer#99, the request-level values stay the default for batteries without configured efficiency

🤖 Generated with Claude Code

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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