fix: Fix pre-commit issues and update tests

- Fix import sorting and unused imports
- Update type annotations to use built-in types (list, dict) instead of typing.List/Dict
- Fix trailing whitespace and end-of-file issues
- Fix Chinese fullwidth comma to regular comma
- Update test_main_cli.py to test_document_rag.py
- Add backward compatibility test for main_cli_example.py
- Pass all pre-commit hooks (ruff, ruff-format, etc.)

examples/PARAMETER_CONSISTENCY.md

@@ -61,4 +61,4 @@ This document ensures that the new unified interface maintains exact parameter c
 
 5. **Special Cases**:
    - WeChat uses a specific Chinese embedding model
-   - Email reader includes HTML processing option 
+   - Email reader includes HTML processing option