fix:change the http error code

[Marsyew]

No description provided.

[hongcha98]

Not all the type errors you enumerate here need to come from anyhow::Error. You can customize the source of the error.
You can change it to the following

#[derive(Debug, Error)]
pub enum AppError {
    #[error("resource {0} not found")]
    ResourceNotFound(String),
    #[error("resource {0} already exists")]
    ResourceAlreadyExists(String),
    #[error("internal server error")]
    InternalServerError(anyhow::Error),
}

Then implement the corresponding Response

[hongcha98]

You can define a our Result type and change the function return type from anyhow::Result to our own Result type