refactor: modularize application domains

src/modules/energy/electric-daily/model.test.ts

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+import assert from 'node:assert/strict';
+import test from 'node:test';
+import type { ElectricMonthGroup } from '../types';
+import { summarizeElectricMonths } from './model';
+
+test('electric daily summary preserves totals, active-day and 30 percent boundaries', () => {
+  const months: ElectricMonthGroup[] = [
+    {
+      month: '2026-08',
+      kwh: 150,
+      fee: 75,
+      rows: [
+        { date: '2026-08-01', kwh: 100, fee: 50, chainPct: 0.3 },
+        { date: '2026-08-02', kwh: 50, fee: 25, chainPct: -0.29 },
+        { date: '2026-08-03', kwh: 0, fee: 0, chainPct: -1 },
+      ],
+    },
+  ];
+
+  assert.deepEqual(summarizeElectricMonths(months), {
+    totalKwh: 150,
+    totalFee: 75,
+    activeDays: 2,
+    abnormalDays: 2,
+    avgKwh: 75,
+    avgPrice: 0.5,
+    hasFeeDetail: true,
+  });
+});
+
+test('electric daily summary preserves empty and missing-fee fallbacks', () => {
+  assert.deepEqual(summarizeElectricMonths(null), {
+    totalKwh: 0,
+    totalFee: 0,
+    activeDays: 0,
+    abnormalDays: 0,
+    avgKwh: 0,
+    avgPrice: 0,
+    hasFeeDetail: false,
+  });
+});

src/modules/energy/electric-daily/model.ts

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+import type { ElectricMonthGroup } from '../types';
+
+export function summarizeElectricMonths(months: ElectricMonthGroup[] | null) {
+  const source = months ?? [];
+  const totalKwh = source.reduce((sum, month) => sum + (month.kwh || 0), 0);
+  const totalFee = source.reduce((sum, month) => sum + (month.fee || 0), 0);
+  const activeDays = source.reduce(
+    (sum, month) => sum + month.rows.filter(row => row.kwh > 0).length,
+    0,
+  );
+  const abnormalDays = source.reduce(
+    (sum, month) => sum + month.rows.filter(row => Math.abs(row.chainPct) >= 0.3).length,
+    0,
+  );
+
+  return {
+    totalKwh,
+    totalFee,
+    activeDays,
+    abnormalDays,
+    avgKwh: activeDays > 0 ? totalKwh / activeDays : 0,
+    avgPrice: totalKwh > 0 ? totalFee / totalKwh : 0,
+    hasFeeDetail: totalFee > 0,
+  };
+}