🔧 Update OpenAI API request format and test cassettes

Modernize OpenAI API request format with updated parameters and service tier headers. Update test cassettes to match new API response structure. Remove default empty string for git_message_detail.

aicodebot/commands/commit.py

@@ -12,7 +12,6 @@
 class CommitMessage(BaseModel):
     # Note we get better results if the message_detail is first.
     git_message_detail: str | None = Field(
-        default="",
         description="An optional detailed explanation of the changes made in this commit,"
         " if the summary doesn't provide enough context",
     )
@@ -57,9 +56,7 @@ def commit(response_token_size, yes, skip_pre_commit, files):  # noqa: PLR0915
         files = unstaged_files
     else:
         # The list of files to be committed is the same as the list of staged files
-        console.print(
-            "The following files have been staged and are ready for commit:\n\t" + "\n\t".join(staged_files)
-        )
+        console.print("The following files have been staged and are ready for commit:\n\t" + "\n\t".join(staged_files))
 
         files = staged_files