fix: resolve CI linting and type checking issues

config_converter/converters/ini_converter.py

@@ -1,9 +1,8 @@
 """INI format converter."""
 
-import re
 from configparser import ConfigParser, RawConfigParser
 from pathlib import Path
-from typing import Any, Dict, Optional
+from typing import Any, Dict, Union
 
 from config_converter.converters.base import BaseConverter, ConversionError
 
@@ -40,7 +39,7 @@ class IniConverter(BaseConverter):
     FORMAT_NAME = "ini"
     FILE_EXTENSIONS = ["ini", "cfg"]
 
-    def read(self, source: str | Path) -> Dict[str, Any]:
+    def read(self, source: Union[str, Path]) -> Dict[str, Any]:
         """Read and parse an INI configuration file."""
         try:
             config = RawConfigParser(allow_no_value=True)
@@ -69,7 +68,7 @@ class IniConverter(BaseConverter):
         except Exception as e:
             raise ConversionError(f"Invalid INI in {source}: {e}") from e
 
-    def write(self, data: Dict[str, Any], target: str | Path) -> None:
+    def write(self, data: Dict[str, Any], target: Union[str, Path]) -> None:
         """Write configuration data to an INI file."""
         try:
             config = ConfigParser()
@@ -89,8 +88,6 @@ class IniConverter(BaseConverter):
     def parse(self, content: str) -> Dict[str, Any]:
         """Parse INI content from a string."""
         try:
-            from io import StringIO
-
             config = RawConfigParser(allow_no_value=True)
             config.read_string(content)
             result: Dict[str, Any] = {}