Fix package structure and lazy-import ODT formatter

Add missing __init__.py to formatters/ so setuptools.find_packages
includes the subpackage in wheel/sdist builds (#16).

Move ODTFormatter import from top-level to lazy import inside
get_formatter_by_extension() so missing odfpy no longer crashes module
load before main() runs. Remove dead except ImportError handler in
cli.py save() block; surface a clear 'odfpy is not installed' message
when the formatter factory returns None for .odt (#25).

Closes #16, closes #25

tests/test_formatters.py

@@ -128,6 +128,97 @@ def odt_formatter():
         yield ODTFormatter(author="Тест Автор", from_date="2026-01-01", to_date="2026-01-31")
 
 
+# -- Тесты упаковки formatters как полноценного пакета --
+
+
+def test_formatters_is_regular_package():
+    """redmine_reporter.formatters — полноценный пакет с __init__.py, не namespace."""
+    import redmine_reporter.formatters
+
+    assert hasattr(redmine_reporter.formatters, "__file__")
+    assert redmine_reporter.formatters.__file__.endswith("__init__.py")
+
+
+def test_formatters_found_by_setuptools():
+    """setuptools.find_packages находит formatters как полноценный пакет."""
+    import os
+
+    from setuptools import find_packages
+
+    project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    found = find_packages(where=project_root, include=["redmine_reporter*"])
+    assert "redmine_reporter.formatters" in found
+
+
+# -- Тесты ленивого импорта ODT (#25) --
+
+
+def _simulate_missing_odfpy():
+    """Вспомогательная функция: подготавливает очистку кэша модулей odf и odt.
+
+    Возвращает словарь сохранённых модулей для последующего восстановления.
+    """
+    import sys
+
+    saved = {}
+    for key in list(sys.modules.keys()):
+        if key == "odf" or key.startswith("odf.") or key == "redmine_reporter.formatters.odt":
+            saved[key] = sys.modules.pop(key)
+    return saved
+
+
+def _restore_modules(saved):
+    import sys
+
+    sys.modules.update(saved)
+
+
+def test_get_formatter_odt_returns_none_without_odfpy():
+    """Без odfpy — get_formatter_by_extension('.odt') возвращает None, не падает."""
+    import builtins
+
+    from redmine_reporter.formatters.factory import get_formatter_by_extension
+
+    real_import = builtins.__import__
+
+    def blocking_import(name, *args, **kwargs):
+        if name == "odf" or name.startswith("odf."):
+            raise ImportError(f"No module named '{name}'")
+        return real_import(name, *args, **kwargs)
+
+    saved = _simulate_missing_odfpy()
+    try:
+        with mock.patch("builtins.__import__", side_effect=blocking_import):
+            result = get_formatter_by_extension(
+                ".odt", author="test", from_date="2026-01-01", to_date="2026-01-31"
+            )
+            assert result is None
+    finally:
+        _restore_modules(saved)
+
+
+def test_get_formatter_csv_works_without_odfpy():
+    """Без odfpy — get_formatter_by_extension('.csv') работает нормально."""
+    import builtins
+
+    from redmine_reporter.formatters.factory import get_formatter_by_extension
+
+    real_import = builtins.__import__
+
+    def blocking_import(name, *args, **kwargs):
+        if name == "odf" or name.startswith("odf."):
+            raise ImportError(f"No module named '{name}'")
+        return real_import(name, *args, **kwargs)
+
+    saved = _simulate_missing_odfpy()
+    try:
+        with mock.patch("builtins.__import__", side_effect=blocking_import):
+            result = get_formatter_by_extension(".csv")
+            assert result is not None
+    finally:
+        _restore_modules(saved)
+
+
 # -- Параметризованные тесты текстовых форматтеров --
 
 TEXT_FORMATTER_FACTORIES = [