Add WW boost enable/disable toggle (persistent flag file)

In summer the WW boost interferes with car charging priority.
A new ⛔/✅ toggle on the WW consumer card persists to
/etc/ems/ww-boost-off (presence = disabled, absence = enabled).

- config: ww_boost_disable_file flag file path
- main: wwBoostDisabled mode, wwBoostToggleHandler, runCycle skips
  computeWWBoost when disabled
- status: WWBoostDisabled in pageData, toggle button in WW card
  showing ⛔ Boost aus / ✅ Boost ein depending on state

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/status/status.go

@@ -59,25 +59,27 @@ type Store struct {
 	strategic    config.StrategicConfig
 	consumers    map[engine.Consumer]*consumerRecord
 	fcResult     *forecast.Result
-	monitorMode  *monitor.Mode
-	tripMgr      *trip.Manager
-	carOptions   []CarOption
+	monitorMode     *monitor.Mode
+	wwBoostDisabled *monitor.Mode
+	tripMgr         *trip.Manager
+	carOptions      []CarOption
 }
 
 // NewStore creates a new status store.
-func NewStore(dryRun bool, wwConfigured bool, strategic config.StrategicConfig, mode *monitor.Mode, tm *trip.Manager, cars []CarOption) *Store {
+func NewStore(dryRun bool, wwConfigured bool, strategic config.StrategicConfig, mode *monitor.Mode, wwBoostDisabled *monitor.Mode, tm *trip.Manager, cars []CarOption) *Store {
 	consumers := make(map[engine.Consumer]*consumerRecord, len(consumerOrder))
 	for _, c := range consumerOrder {
 		consumers[c] = &consumerRecord{}
 	}
 	return &Store{
-		dryRun:       dryRun,
-		wwConfigured: wwConfigured,
-		strategic:    strategic,
-		consumers:    consumers,
-		monitorMode:  mode,
-		tripMgr:      tm,
-		carOptions:   cars,
+		dryRun:          dryRun,
+		wwConfigured:    wwConfigured,
+		strategic:       strategic,
+		consumers:       consumers,
+		monitorMode:     mode,
+		wwBoostDisabled: wwBoostDisabled,
+		tripMgr:         tm,
+		carOptions:      cars,
 	}
 }
 
@@ -179,6 +181,7 @@ type pageData struct {
 	ErrMsg           string
 	DryRun           bool
 	MonitorOnly      bool
+	WWBoostDisabled  bool
 	BatterySOC       float64
 	GridPowerW       float64
 	PVProductionW    float64
@@ -261,6 +264,7 @@ func (s *Store) Handler() http.HandlerFunc {
 		}
 
 		monitorOnly := s.monitorMode != nil && s.monitorMode.IsActive()
+		wwBoostDisabled := s.wwBoostDisabled != nil && s.wwBoostDisabled.IsActive()
 		now := time.Now()
 
 		s.mu.RLock()
@@ -271,6 +275,7 @@ func (s *Store) Handler() http.HandlerFunc {
 			ErrMsg:           s.errMsg,
 			DryRun:           s.dryRun,
 			MonitorOnly:      monitorOnly,
+			WWBoostDisabled:  wwBoostDisabled,
 			BatterySOC:       s.state.BatterySOC,
 			GridPowerW:       s.state.GridPowerW,
 			PVProductionW:    s.state.PVProductionW,
@@ -902,6 +907,15 @@ h1 { font-size: 1.4rem; font-weight: 700; color: #14532d; }
     <button type="submit" class="override-btn turn-off" title="WW-Solltemperatur auf Basiswert zurücksetzen, Boost für heute sperren">🌡️ Zurücksetzen</button>
   </form>
   {{end}}
+  {{if .IsWW}}
+  <form method="post" action="/ww/boost" style="flex-shrink:0">
+    {{if .WWBoostDisabled}}
+    <button type="submit" class="override-btn turn-on" title="WW Boost durch PV-Überschuss wieder erlauben">✅ Boost ein</button>
+    {{else}}
+    <button type="submit" class="override-btn turn-off" title="WW Boost dauerhaft deaktivieren (z.B. im Sommer)">⛔ Boost aus</button>
+    {{end}}
+  </form>
+  {{end}}
 </div>
 {{end}}