* feat: Add support for quarterly cycle tracking in Power Max Tracker

- Introduced CONF_CYCLE_TYPE to allow selection between hourly and quarterly cycles.
- Updated PowerMaxCoordinator to handle different cycle types, including methods for calculating cycle start times and updating statistics.
- Modified sensor initialization to reflect the selected cycle type in sensor names.
- Enhanced tests to cover new quarterly cycle functionality and ensure correct behavior for both cycle types.
- Added German translation for new configuration options and updated existing translations for clarity.

Fixes #31

* fix: Correct JSON structure for cycle type selector in English translation