Modernize type hints in ai/ module to Python 3.12+ syntax

[davidpoblador]

Summary

The ai module uses legacy typing import that can be replaced with Python 3.12+ built-in syntax.

File to update

• src/blogtuner/ai/llm.py

Current import

from typing import Optional

Proposed change

Remove the typing import entirely and replace all Optional[X] with X | None.

Example

# Before
from typing import Optional
additional_info: Optional[str] = None

# After
additional_info: str | None = None

Priority

Medium