feat: output path defaults (#43) + datetime precision & dedup (#47)

#43 — Имя файла и пути по умолчанию:
- resolve_output_path() в yaml_config.py: резолвит --output с учётом
  output.dir, filename_template, default_format из YAML-конфига
- Bare format (xlsx/odt/...) → путь по шаблону
- Без расширения → автодописывается default_format (.xlsx)
- Config.get_output_dir/filename/default_format()

#47 — datetime precision и дедупликация:
- period.last_used.from/to в YAML-конфиге и AppConfig
- period.precision: date|datetime
- _compute_dedup_cutoff() в cli.py: при precision=datetime вычисляет
  cutoff из period.last_used.to
- _parse_datetime() + AND-логика дедупликации в client.py:
  запись исключается если created_on И updated_on < cutoff
- Пропуск issues без часов после дедупликации

Closes #43
Closes #47

tests/test_yaml_config.py

@@ -122,3 +122,87 @@ class TestExpandFilenameTemplate:
             ext="xlsx",
         )
         assert result == "Кокос_А.А._{unknown}.xlsx"
+
+
+class TestResolveOutputPath:
+    """Tests for resolve_output_path()."""
+
+    def test_none_returns_none(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        assert resolve_output_path(None) is None
+
+    def test_explicit_path_with_known_extension_is_unchanged(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path("/tmp/report.xlsx")
+        assert result == "/tmp/report.xlsx"
+
+    def test_explicit_path_with_unknown_extension_is_unchanged(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path("report.odt")
+        assert result == "report.odt"
+
+    def test_no_extension_appends_default_format(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path("report", default_format="xlsx")
+        assert result == "report.xlsx"
+
+    def test_no_extension_appends_custom_default_format(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path("file", default_format="csv")
+        assert result == "file.csv"
+
+    def test_bare_format_name_resolves_to_template_path(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path(
+            "xlsx",
+            output_dir="/tmp/reports",
+            filename_template="{date}.{ext}",
+            author="Кокос А.А.",
+            from_date="2026-06-01",
+            to_date="2026-06-30",
+            default_format="xlsx",
+        )
+        assert result == "/tmp/reports/30_06_2026.xlsx"
+
+    def test_bare_format_name_odt_resolves_to_template_path(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path(
+            "odt",
+            output_dir="~/reports",
+            filename_template="{author}_{from}_{to}.{ext}",
+            author="Кокос А.А.",
+            from_date="2026-06-01",
+            to_date="2026-06-30",
+            default_format="xlsx",
+        )
+        assert result.startswith("/") and result.endswith(
+            "/reports/Кокос_А.А._2026-06-01_2026-06-30.odt"
+        )
+        assert "~" not in result
+
+    def test_bare_format_name_with_empty_output_dir_uses_cwd(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path(
+            "csv",
+            output_dir="",
+            filename_template="report.{ext}",
+            author="A",
+            from_date="2026-01-01",
+            to_date="2026-01-31",
+        )
+        assert not result.startswith("/")
+        assert "report.csv" in result
+
+    def test_unknown_bare_format_is_treated_as_path(self):
+        from redmine_reporter.yaml_config import resolve_output_path
+
+        result = resolve_output_path("unknown_format")
+        assert result == "unknown_format.xlsx"