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/Redis/RedisConfig.php

@@ -12,7 +12,7 @@ use App\Framework\Config\EnvKey;
  */
 final readonly class RedisConfig
 {
-    public function __construct(
+    private function __construct(
         public string $host = 'redis',
         public int $port = 6379,
         public ?string $password = null,