Code review of the PPT Secretary codebase with fixes for linting issues, missing package structure, and code quality improvements.

Changes

• Package structure: Add ppt_tool/__init__.py for proper Python package initialization
• Type hints: Add comprehensive type annotations to ppt_api.py

def add_rounded_textbox(
    slide: Slide,
    text: str,
    left: Union[int, Emu],
    top: Union[int, Emu],
    ...
) -> BaseShape:

• Import cleanup: Remove unused imports (platform, MSO_SHAPE_TYPE, Presentation), move traceback to module level
• Linting fixes: Trailing whitespace, blank line spacing, multi-statement lines
• Bug fix: Complete test.py with missing prs.save() and fix unterminated string literals
• Security docs: Add comment documenting exec() risk in modifier.py

All existing tests pass. CodeQL reports no vulnerabilities.

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