Fix code quality: trailing whitespace, unused imports, clippy warnings

- Fix trailing whitespace in kex.rs and s3.rs
- Add missing KexProposal import in kex_complete.rs
- Auto-fix clippy warnings across all crates
- All 153 tests pass

markbase-smb/src/auth.rs

@@ -1,5 +1,5 @@
-use anyhow::Result;
 use crate::acl::AccessControlList;
+use anyhow::Result;
 
 pub struct AuthManager {
     acl: AccessControlList,
@@ -9,26 +9,26 @@ impl AuthManager {
     pub fn new(acl: AccessControlList) -> Self {
         AuthManager { acl }
     }
-    
+
     pub fn authenticate(&self, username: &str, password: Option<&str>) -> Result<bool> {
         if self.acl.guest_access && password.is_none() {
             return Ok(true);
         }
-        
+
         if password.is_none() {
             return Err(anyhow::anyhow!("Password required for user {}", username));
         }
-        
+
         if self.acl.get_user(username).is_none() {
             return Err(anyhow::anyhow!("User {} not in ACL", username));
         }
-        
+
         Ok(true)
     }
-    
+
     pub fn check_permission(&self, username: &str, action: &str) -> Result<bool> {
         let require_write = action == "write" || action == "delete" || action == "create";
-        
+
         if !self.acl.has_access(username, require_write) {
             return Err(anyhow::anyhow!(
                 "User {} does not have {} permission",
@@ -36,15 +36,15 @@ impl AuthManager {
                 action
             ));
         }
-        
+
         Ok(true)
     }
-    
+
     pub fn get_acl(&self) -> &AccessControlList {
         &self.acl
     }
-    
+
     pub fn update_acl(&mut self, acl: AccessControlList) {
         self.acl = acl;
     }
-}
+}