Fix Typo in `generate_code_from_issue_and_reply`: Replace `velify_modification` with `verify_modification

[tawada]

After thoroughly reviewing the code of the existing program, one issue that stands out is in the function generate_modification_from_issue within the logic/__init__.py file. Specifically, the function uses a typo in the method name verify_modification when raising an error.

def generate_code_from_issue_and_reply(
    issue_id: int,
    repo: str,
    branch: str = "main",
    code_lang: str = "python",
):
    ...
    is_valid = logic.velify_modification(repo, modification)  # Here, `velify_modification` should be `verify_modification`
    ...

The correct method name based on the context provided in the same module should be verify_modification, but it is mistakenly called velify_modification in this block of code. This could lead to AttributeError at runtime when trying to call a non-existent function, potentially causing failure in processing the request as intended in the generate_code_from_issue_and_reply function. Correcting this typo will ensure that the code integrity check is performed as expected before proceeding with issue modification commitments.