- Updated Doxygen comments in header files (valve.h, fwu.h, modbus_server.h) to be consistent and in English.
- Translated German register names in docs/modbus-registers.de.md to English.
- Updated docs/concept.de.md to reflect new details on current measurement and sensors.
- Updated docs/planning.de.md to reflect completed tasks in Phase 1.
- Implemented VND7050AJ and core functionality including current and voltage measurement and end-position detection.