[Feature]: Support only one line commit message and adjustment type

Description

1. The current commit is divided into individual messages for each file, but sometimes the entire function will affect different files. I hope there is only a single line of commit message that includes the results of multiple files combined.

2. Also, sometimes the type of commit judged by OCO differs from my perception. I hope there can be an option to choose what type of current commit it is, such as OCO thinks it's a fix but I might think it's a feat.

Suggested Solution

The current format is:

fix (filename): description
feat (filename): description

I hope it can be changed to:

fix: description of all of the files

Assume the current result generated by OCO is:

fix (filename): description

I hope it can be adjusted to other types, such as:

feat (filename): description

Alternatives

No response

Additional Context

No response

The issue does not name files or tests. Start by locating the code that generates per-file commit messages and determines the commit type, then trace how the generated result reaches the CLI. Done means supporting one combined message and allowing the user to adjust the suggested type, with coverage for both behaviors.