fix: add missing role field to User struct, fix unused variable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/rpc/backup_rpc.rs

@@ -176,7 +176,7 @@ impl RpcHandler {
         let secret_key = params["secret_key"]
             .as_str()
             .ok_or_else(|| anyhow::anyhow!("Missing 'secret_key' parameter"))?;
-        let region = params["region"].as_str().unwrap_or("us-east-1");
+        let _region = params["region"].as_str().unwrap_or("us-east-1");
 
         // Validate backup ID
         if id.is_empty() || id.len() > 128 || id.contains('/') || id.contains('\\') || id.contains("..") || id.contains('\0') {

core/archipelago/src/auth.rs

@@ -120,6 +120,7 @@ impl AuthManager {
             setup_complete: true,
             onboarding_complete,
             totp: None,
+            role: UserRole::default(),
         };
 
         let user_file = self.data_dir.join("user.json");