feat: add energy, weather and consumption endpoints with models and error handling

src/models/energy.py

@@ -0,0 +1,15 @@
+from pydantic import BaseModel, Field
+from datetime import datetime
+
+
+class Spot(BaseModel):
+    price: float = Field(..., description="Price in cents per kWh")
+    start_date: datetime = Field(..., description="Start date")
+    end_date: datetime = Field(..., description="End date")
+
+
+class Consumption(BaseModel):
+    timestamp: datetime = Field(..., description="Timestamp")
+    consumption: float = Field(..., description="Consumption in kWh")
+    total_cost: float = Field(..., description="Total cost in euros")
+    vat_percentage: float = Field(..., description="VAT percentage")