feat: add Redis username authentication support

- Add username config option to Redis configuration
- Support both username+password and password-only auth methods
- Maintain backward compatibility with existing password-only setups
- Improve error messages for authentication failures

Signed-off-by: Sanil Shrestha <sanil.shrestha@formbay.com.au>

Author: formbay-sanil

src/Handlers/RedisHandler.php

@@ -41,8 +41,11 @@ public function __construct(protected QueueConfig $config)
                 throw new CriticalError('Queue: Redis connection failed. Check your configuration.');
             }
 
+            if (isset($config->redis['username'], $config->redis['password']) && ! $this->redis->auth([$config->redis['username'], $config->redis['password']])) {
+                throw new CriticalError('Queue: Redis authentication failed. Check your username and password.');
+            }
             if (isset($config->redis['password']) && ! $this->redis->auth($config->redis['password'])) {
-                throw new CriticalError('Queue: Redis authentication failed.');
+                throw new CriticalError('Queue: Redis authentication failed. Check your password.');
             }
 
             if (isset($config->redis['database']) && ! $this->redis->select($config->redis['database'])) {