feat: unify system status codes

template/sysroot/include/montauk/user.h

@@ -219,6 +219,16 @@ namespace user {
         return false;
     }
 
+    inline bool is_admin(const char* username) {
+        UserInfo users[MAX_USERS];
+        int count = load_users(users, MAX_USERS);
+        for (int i = 0; i < count; i++) {
+            if (montauk::streq(users[i].username, username))
+                return montauk::streq(users[i].role, "admin");
+        }
+        return false;
+    }
+
     // ---- User management ----
 
     inline bool create_user(const char* username, const char* display_name,