refacto: rename app into backend, to prepare for frontend dev

server/backend/domain/entities/consumption_point.py

@@ -0,0 +1,19 @@
+from dataclasses import dataclass
+from datetime import datetime
+from domain.value_objects import Granularity
+
+@dataclass
+class ConsumptionPoint:
+    period: datetime
+    pulse_count_start: int
+    pulse_count_end: int
+    delta_pulses: int
+    delta_m3: float
+
+@dataclass
+class ConsumptionResponse:
+    dev_eui: str
+    start: datetime
+    end: datetime
+    granularity: Granularity
+    points: list[ConsumptionPoint]