refactor: simplify Redis configuration initialization

- Use RedisConfig::fromEnvironment() in LoggerInitializer
- Remove fallback logic in QueueInitializer, always use connection pool
- Make RedisConfig constructor private
- Clean up Redis connection error message

src/Framework/Logging/LoggerInitializer.php

@@ -121,7 +121,7 @@ final readonly class LoggerInitializer
      */
     private function createQueue(Environment $env): Queue
     {
-        $redisConfig = new RedisConfig(host: $env->getString(EnvKey::REDIS_HOST, 'redis'), database: 2);
+        $redisConfig = RedisConfig::fromEnvironment($env);
         $redisConnection = new RedisConnection($redisConfig, 'queue');
 
         return new RedisQueue($redisConnection, 'commands');