Add ODF (.ods) support via odfpy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_reader.py

@@ -72,6 +72,18 @@ def test_read_column_skip(xlsx_file: Path):
     assert "Preis" not in df.columns
 
 
+def test_read_ods(tmp_path: Path):
+    pytest.importorskip("odf")
+    path = tmp_path / "test.ods"
+    df = pd.DataFrame({"Name": ["Alice", "Bob"], "Wert": [1, 2]})
+    df.to_excel(path, index=False, engine="odf")
+
+    reader = ExcelReader(path)
+    result = reader.read(SheetConfig(sheet=0, target_table="t"))
+    assert len(result) == 2
+    assert list(result.columns) == ["Name", "Wert"]
+
+
 def test_file_not_found():
     with pytest.raises(FileNotFoundError):
         ExcelReader("/nonexistent/path/file.xlsx")