Fix compressor watts, add WW boost reset button

Compressor:
- metric changed to PromQL expression that returns actual watts:
  sensors_power_value(%) × power_value(kW) × 10
  e.g. 27% × 10 kW = 2700 W; idle = 0 W
- idle threshold raised 20→500 W (clean gap: 0W idle vs ≥2700W running)
- status page now displays real kW instead of percent

WW boost reset:
- Added 🌡️ Zurücksetzen button to WW consumer card (when configured)
- POST /ww/reset: restores WWBaseC via Viessmann API + blocks re-boost
  via engine override until midnight
- IsWW field added to consumerView for template control

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

internal/status/status.go

@@ -133,6 +133,7 @@ type consumerView struct {
 	Reason         string
 	Unconfigured   bool
 	CanOverride    bool // true for Shelly consumers (hardware read-back available)
+	IsWW           bool // true for ConsumerWW — shows reset button instead of override
 	ManualOverride bool
 	OverrideUntil  time.Time
 	LivePowerW     float64 // from Shelly PM; 0 for non-PM devices
@@ -334,6 +335,7 @@ func (s *Store) Handler() http.HandlerFunc {
 				Since:          rec.since,
 				Reason:         rec.reason,
 				CanOverride:    c != engine.ConsumerWW,
+				IsWW:           c == engine.ConsumerWW,
 				ManualOverride: rec.manualOverride,
 				OverrideUntil:  rec.overrideUntil,
 				LivePowerW:     rec.livePowerW,
@@ -895,6 +897,11 @@ h1 { font-size: 1.4rem; font-weight: 700; color: #14532d; }
     {{end}}
   </form>
   {{end}}
+  {{if and .IsWW (not .Unconfigured)}}
+  <form method="post" action="/ww/reset" style="flex-shrink:0">
+    <button type="submit" class="override-btn turn-off" title="WW-Solltemperatur auf Basiswert zurücksetzen, Boost für heute sperren">🌡️ Zurücksetzen</button>
+  </form>
+  {{end}}
 </div>
 {{end}}