feat: JSON, Excel export and time summary

- #23: add JSONFormatter and XLSXFormatter
- add openpyxl dependency for .xlsx export
- #22: add --summary flag and calculate_summary() in report_builder
- ReportRow now carries raw hours for summary calculations
- update CLI help and README with .json/.xlsx formats and --summary
- add tests for new formatters and summary computation

Closes #22, closes #23

tests/test_report_builder.py

@@ -1,6 +1,7 @@
 from redmine_reporter.report_builder import (
     STATUS_TRANSLATION,
     build_grouped_report,
+    calculate_summary,
     group_rows_by_project_and_version,
 )
 
@@ -60,7 +61,61 @@ def test_build_grouped_report_grouping():
 
     assert rows[0]["status_ru"] == "В работе"
     assert rows[0]["time_text"] == "2ч"
+    assert rows[0]["hours"] == 2.0
     assert rows[1]["time_text"] == "1ч 30м"
+    assert rows[1]["hours"] == 1.5
+
+
+# -- #22: Сводка по времени --
+
+
+def test_calculate_summary_totals():
+    """Сводка содержит общее время и разбивку по проектам/версиям."""
+    rows = [
+        {
+            "project": "Камеры",
+            "version": "v2.5.0",
+            "issue_id": 101,
+            "subject": "Фича A",
+            "status_ru": "В работе",
+            "time_text": "2ч",
+            "hours": 2.0,
+        },
+        {
+            "project": "Камеры",
+            "version": "v2.5.0",
+            "issue_id": 102,
+            "subject": "Баг B",
+            "status_ru": "Решена",
+            "time_text": "1ч 30м",
+            "hours": 1.5,
+        },
+        {
+            "project": "ПО",
+            "version": "<N/A>",
+            "issue_id": 201,
+            "subject": "Доки",
+            "status_ru": "Ожидание",
+            "time_text": "4ч",
+            "hours": 4.0,
+        },
+    ]
+    summary = calculate_summary(rows)
+
+    assert summary["total"] == 7.5
+    assert summary["project:Камеры"] == 3.5
+    assert summary["project:ПО"] == 4.0
+    assert summary["version:Камеры::v2.5.0"] == 3.5
+    assert summary["version:ПО::<N/A>"] == 4.0
+
+
+def test_calculate_summary_empty():
+    """Сводка для пустого списка -- только total = 0."""
+    summary = calculate_summary([])
+    assert summary == {"total": 0.0}
+
+
+# -- #19: Общая функция группировки --
 
 
 def test_build_grouped_report_new_version_same_project():