feat: 空白作息区间计入加班工时

tests/test_metrics.py

@@ -280,3 +280,33 @@ def test_admin_forced_release_still_caps_work_time():
     assert metrics["duration_minutes"] == 60
     assert metrics["effective_minutes"] == 60
     assert item.allocated_minutes == 60
+
+
+def test_morning_blank_interval_counts_as_overtime():
+    start_at = datetime(2026, 7, 25, 6, 0, 0)
+    end_at = datetime(2026, 7, 25, 8, 0, 0)
+    item = Item(good_qty=10)
+
+    metrics = calculate_report_metrics(start_at, end_at, [item])
+
+    assert metrics["duration_minutes"] == 120
+    assert metrics["effective_minutes"] == 120
+    assert metrics["shift_day_minutes"] == 0
+    assert metrics["shift_overtime_minutes"] == 120
+    assert metrics["shift_night_minutes"] == 0
+    assert item.allocated_minutes == 120
+
+
+def test_dinner_blank_interval_counts_as_overtime():
+    start_at = datetime(2026, 7, 25, 17, 20, 0)
+    end_at = datetime(2026, 7, 25, 18, 0, 0)
+    item = Item(good_qty=10)
+
+    metrics = calculate_report_metrics(start_at, end_at, [item])
+
+    assert metrics["duration_minutes"] == 40
+    assert metrics["effective_minutes"] == 40
+    assert metrics["shift_day_minutes"] == 0
+    assert metrics["shift_overtime_minutes"] == 40
+    assert metrics["shift_night_minutes"] == 0
+    assert item.allocated_minutes == 40