fix(config): update variable names and remove unused imports

Refactor variable names to follow snake_case convention and remove unused imports across multiple files to improve code readability and maintainability.

harmony-rs/opnsense-config/src/config/config.rs

@@ -1,4 +1,4 @@
-use std::{sync::Arc, time::Duration};
+use std::sync::Arc;
 
 use crate::{
     config::{SshConfigManager, SshCredentials, SshOPNSenseShell},

harmony-rs/opnsense-config/src/config/shell/ssh.rs

@@ -12,8 +12,8 @@ use russh::{
     Channel,
 };
 use russh_keys::key;
-use russh_sftp::{client::SftpSession, protocol::OpenFlags};
-use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use russh_sftp::client::SftpSession;
+use tokio::io::AsyncWriteExt;
 
 use crate::{config::SshCredentials, Error};
 

harmony-rs/opnsense-config/src/modules/dhcp.rs

@@ -1,8 +1,6 @@
 use log::info;
 use opnsense_config_xml::MaybeString;
-use opnsense_config_xml::Range;
 use opnsense_config_xml::StaticMap;
-use std::cmp::Ordering;
 use std::net::Ipv4Addr;
 use std::sync::Arc;
 

harmony-rs/opnsense-config/src/modules/dns.rs

@@ -1,6 +1,5 @@
 use opnsense_config_xml::{Host, OPNsense};
 
-use crate::config::OPNsenseShell;
 
 pub struct DnsConfig<'a> {
     opnsense: &'a mut OPNsense,