- Add platform:integration sensors for thermal and electrical energy (W→kWh)
- Fix utility_meter sources to use integration sensors (not power sensors directly)
- Remove invalid unit_of_measurement from utility_meter entries
- Add SCOP dzienny/miesięczny template sensors
- Replace scop_pompy_sezonowy (wrong power_output_lo register) with
  scop_dzienny and scop_miesieczny (calorimetric, from utility meters)
- energia_cieplna_pompy_total: integrates moc_cieplna_pompy [W] → kWh
- energia_elektryczna_pompy_total: integrates moc_pompy_aktualna [kW] → kWh

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>