MAINT-28: during a real peak the maintenance charge stays paused until the house is clear of the aim

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/app/main.py

@@ -505,6 +505,7 @@ class Controller(InputsMixin, WritesMixin, TradeMixin, CycleMixin, AlarmsMixin,
         self._land_batt_prev = None
         self._peak_needed = False
         self._maint_shape_suspended = False
+        self._maint_peak_hold = False          # MAINT-28
         # OPT-11: battery modes, off by default (SAFETY-10 section 1). Each
         # battery's mode and on/off switch live in the store, not in options,
         # so a change applies at once (`pack_use`, `pack_mode`).