added apliance

app.py

@@ -20,6 +20,7 @@ APPLIANCES = {
     "Instant Shower": {"power_kw": 3.5, "usage_hours": 0.5, "grid_only": True},
     "Electric Kettle": {"power_kw": 1.5, "usage_hours": 0.25, "grid_only": True},
     "Microwave": {"power_kw": 1.2, "usage_hours": 0.2, "grid_only": True},
+    "Oven": {"power_kw": 1.0, "usage_hours": 0.3, "grid_only": True},
 }