Energyflow UI: names instead of placeholders

[naltatis]

In #29846 we published the name field for all meters. This PR replaced the generic Solar system #1, Battery storage #1, ... entries for yaml configured meters and shows name instead. Establishing consistent naming between energyflow and history chart labels.

before (yaml + ui)

after (yaml + ui)

[sourcery-ai]

Hey - I've left some high level feedback:

• By removing the generic*Title fallbacks, entries now depend solely on title or name; consider keeping a last-resort generic label (e.g. via a small helper) so the UI remains readable if a meter is misconfigured or lacks both fields.
• Since genericBatteryTitle, genericPvTitle, and genericConsumerTitle are no longer used, you might also remove any related i18n keys if they are now dead to avoid confusion in the translation files.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- By removing the `generic*Title` fallbacks, entries now depend solely on `title` or `name`; consider keeping a last-resort generic label (e.g. via a small helper) so the UI remains readable if a meter is misconfigured or lacks both fields.
- Since `genericBatteryTitle`, `genericPvTitle`, and `genericConsumerTitle` are no longer used, you might also remove any related i18n keys if they are now dead to avoid confusion in the translation files.

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