v2.1.1 — PV Peak Auto-Derive

UX Improvement

The PV system peak power no longer has to be entered manually — the integration auto-derives it.

Fallback chain:

1. Manual override (config field, if explicitly set)
2. Sum of configured kWp from PV strings × 1000
3. Measured total peak × 1000
4. Default 10 000 W (10 kWp rule of thumb)

If you have your PV strings configured, you can leave the PV peak power field empty. The field stays for special cases (override).

Diagnostic: New attribute pv_peak_quelle on the binary sensors shows which fallback path is active (user_override / pv_strings_kwp / measured_peak / default).