refactor(application): strip comments, DRY ownership check + parse_content_type

crates/application/src/auth/register.rs

@@ -5,33 +5,23 @@ use domain::{DomainResult, Email, Password};
 use super::commands::RegisterCommand;
 use super::deps::AuthDeps;
 
-/// Register a new local user.
-///
-/// Flow: validate email/password -> check duplicate -> hash password ->
-/// create User (first user gets admin) -> save -> publish event -> return User.
 pub async fn execute(deps: &AuthDeps, cmd: RegisterCommand) -> DomainResult<User> {
-    // Validate inputs via domain value objects
     let email = Email::new(&cmd.email)?;
     let password = Password::new(&cmd.password)?;
 
-    // Check for duplicate
     if deps.user_query.find_by_email(email.as_ref()).await?.is_some() {
         return Err(domain::DomainError::UserAlreadyExists(cmd.email));
     }
 
-    // Hash password
     let hash = deps.auth_service.hash_password(password.as_ref())?;
 
-    // Create user; first user gets admin
     let mut user = User::new_local(email, hash);
     if deps.user_query.count_users().await? == 0 {
         user.promote_to_admin();
     }
 
-    // Persist
     deps.user_command.save(&user).await?;
 
-    // Publish event
     deps.event_publisher
         .publish(DomainEvent::UserRegistered {
             user_id: user.id(),