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

redmine_reporter/cli.py

@@ -10,7 +10,7 @@ from . import __version__
 from .client import fetch_issues_with_spent_time
 from .config import Config
 from .formatters.factory import get_console_formatter, get_formatter_by_extension
-from .report_builder import build_grouped_report
+from .report_builder import build_grouped_report, calculate_summary
 
 
 def parse_date_range(date_arg: str) -> tuple[str, str]:
@@ -52,7 +52,7 @@ def main(argv: Optional[List[str]] = None) -> int:
     )
     parser.add_argument(
         "--output",
-        help="Path to output file (.odt, .csv, .md, .html). If omitted, prints to stdout.",
+        help="Path to output file (.odt, .csv, .md, .html, .json, .xlsx). If omitted, prints to stdout.",
     )
     parser.add_argument(
         "--author", default="", help="Override author name from .env (REDMINE_AUTHOR)"
@@ -71,6 +71,11 @@ def main(argv: Optional[List[str]] = None) -> int:
         version=f"%(prog)s {__version__}",
         help="Show version and exit",
     )
+    parser.add_argument(
+        "--summary",
+        action="store_true",
+        help="Print summary (total hours by project/version) to stderr",
+    )
     args = parser.parse_args(argv)
 
     # CLI-переопределения имеют приоритет над .env/env.
@@ -113,12 +118,20 @@ def main(argv: Optional[List[str]] = None) -> int:
 
     rows = build_grouped_report(issue_hours, fill_time=not args.no_time)
 
+    if args.summary:
+        summary = calculate_summary(rows)
+        print(f"⏱️  Total time: {summary['total']}h", file=sys.stderr)
+        for key, value in summary.items():
+            if key.startswith("project:"):
+                project = key.split(":", 1)[1]
+                print(f"   {project}: {value}h", file=sys.stderr)
+
     if args.output:
         output_ext = os.path.splitext(args.output)[1].lower()
 
         if not output_ext:
             print(
-                "❌ Файл без расширения. Укажите расширение: .odt, .csv, .md или .html",
+                "❌ Файл без расширения. Укажите расширение: .odt, .csv, .md, .html, .json или .xlsx",
                 file=sys.stderr,
             )
             return 1
@@ -137,7 +150,7 @@ def main(argv: Optional[List[str]] = None) -> int:
                     file=sys.stderr,
                 )
             else:
-                known_exts = ", ".join([".odt", ".csv", ".md", ".html"])
+                known_exts = ", ".join([".odt", ".csv", ".md", ".html", ".json", ".xlsx"])
                 print(
                     f"❌ Неизвестный формат файла: {output_ext!r}. "
                     f"Поддерживаются: {known_exts}",