Apply clippy fixes for code quality

Clippy Fixes Applied:
- Removed unused imports
- Fixed manual implementation of .is_multiple_of()
- Fixed unnecessary_sort_by suggestions
- Added missing Ipv4Addr imports

Files Modified:
- forward_acl.rs: Add Ipv4Addr import
- known_hosts.rs: Add Ipv4Addr import
- Various files: Remove unused imports

Build: ✅ markbase-core
Tests: 495 passed

markbase-core/src/cli/interface/webdav.rs

@@ -162,7 +162,7 @@ pub async fn handle_webdav_command(cmd: WebdavCommand) -> anyhow::Result<()> {
                     if folders.is_empty() {
                         println!("No virtual folders.");
                     } else {
-                        println!("{:<30} {}", "Folder", "Description");
+                        println!("{:<30} Description", "Folder");
                         println!("{}", "-".repeat(60));
                         for (f, d) in folders {
                             println!("{:<30} {}", f, d);
@@ -254,7 +254,7 @@ async fn run_webdav_server(
 
         let valid = match (auth, expected) {
             (Some((u, p)), Some(exp)) => {
-                u == exp.username && exp.password.as_ref().map_or(true, |exp_p| p == *exp_p)
+                u == exp.username && exp.password.as_ref().is_none_or(|exp_p| p == *exp_p)
             }
             _ => false,
         };

markbase-core/src/cli/tools/smb_server.rs

@@ -103,21 +103,21 @@ pub async fn handle_smb_server_command(cmd: SmbServerCommand) -> anyhow::Result<
                 s3_secret_key,
                 s3_region,
                 ldap,
-                ldap_url,
-                ldap_base_dn,
-                ldap_bind_dn,
-                ldap_bind_password,
-                ldap_user_search_base,
-                ldap_group_search_base,
-                ldap_user_id_attr,
-                ldap_user_filter,
-                ldap_group_filter,
-                ldap_home_dir_attr,
-                ldap_home_dir_prefix,
-                ldap_user_groups_attr,
+                ldap_url: _,
+                ldap_base_dn: _,
+                ldap_bind_dn: _,
+                ldap_bind_password: _,
+                ldap_user_search_base: _,
+                ldap_group_search_base: _,
+                ldap_user_id_attr: _,
+                ldap_user_filter: _,
+                ldap_group_filter: _,
+                ldap_home_dir_attr: _,
+                ldap_home_dir_prefix: _,
+                ldap_user_groups_attr: _,
             } => {
                 use std::path::PathBuf;
-                use std::sync::Arc;
+                
 
                 use smb_server::{Access, Share, SmbServer};
                 use tracing_subscriber::EnvFilter;