chore: bump version to 0.8.7

feat: add charges_kwh and vat_rate to elecprice config

- Configurable surcharges (EUR/kWh) added to market price (default 0.21)
- Configurable VAT rate factor (default 1.19 = 19%)
- Available in both initial setup and options flow
- Pushed to EOS elecprice config for all price providers

chore: bump version to 0.8.5

debug: log price_source on config push

feat: add yearly consumption config for load prediction

EOS LoadAkkudoktor provider requires loadakkudoktor_year_energy_kwh
to generate load forecasts. Without it, prediction update fails and
no optimization can run.

Added as config option in Energy Meters step (default: 12000 kWh).
Bump to v0.8.3.

bump: version 0.8.2

bump: version 0.8.1

fix: EOS adapter compatibility — SOC measurement API, inverter power,…

… price display

FIXES:
- Inverter config: max_power_wh → max_power_w (correct EOS field name)
- Remove invalid initial_soc_percentage from device config (not in EOS schema)
- SOC: push via measurement API with percentage→factor conversion instead
  of device_measurement_entity_ids (which requires factor entities)
- Price display: EUR/Wh → EUR/kWh for user-friendly display

SOC HANDLING (no breaking change):
- Standard HA battery sensors report percentage (0-100) — still accepted
- Integration converts to factor (0.0-1.0) and pushes to EOS via
  PUT /v1/measurement/value on each update cycle
- No template sensor needed, no config changes required

Bump version to 0.8.0

bump: version 0.7.0

docs: rewrite README for v0.6.0 (adapter mode, SG-Ready, appliance ti…

…me windows, blueprints)