refactor(redis): refine connection handling and pool singleton initialization

- Mark `RedisConnection::$connected` as read-only with `private(set)`.
- Simplify authentication and database selection logic in `RedisConnection`.
- Comment out DI container singleton registration in `RedisPoolInitializer`.
- Annotate `RedisConnectionPool` with `#[Singleton]` attribute for improved clarity.

src/Framework/Redis/RedisConnection.php

@@ -14,7 +14,7 @@ final class RedisConnection implements RedisConnectionInterface
 {
     private Redis $client;
 
-    private bool $connected = false;
+    private(set) bool $connected = false;
 
     public function __construct(
         private readonly RedisConfig $config,
@@ -89,15 +89,14 @@ final class RedisConnection implements RedisConnectionInterface
             }
 
             // Authenticate if a password is provided
-            if ($this->config->password) {
-                if (! $this->client->auth($this->config->password)) {
+
+            if ($this->client->auth($this->config->password) === false) {
                 throw new RedisConnectionException("Redis authentication failed");
             }
-            }
 
             // Select database
             if ($this->config->database > 0) {
-                if (! $this->client->select($this->config->database)) {
+                if ($this->client->select($this->config->database) === false) {
                     throw new RedisConnectionException("Failed to select Redis database {$this->config->database}");
                 }
             }

src/Framework/Redis/RedisConnectionPool.php

@@ -4,12 +4,14 @@ declare(strict_types=1);
 
 namespace App\Framework\Redis;
 
+use App\Framework\Attributes\Singleton;
 use InvalidArgumentException;
 
 /**
  * Redis connection pool that manages multiple named connections
  * for different purposes (cache, queue, sessions, etc.)
  */
+#[Singleton]
 final class RedisConnectionPool
 {
     /** @var array<string, RedisConnectionInterface> */

src/Framework/Redis/RedisPoolInitializer.php

@@ -14,7 +14,6 @@ use App\Framework\DI\Initializer;
 final readonly class RedisPoolInitializer
 {
     public function __construct(
-        private Container $container,
         private Environment $environment,
     ) {
     }
@@ -46,7 +45,7 @@ final readonly class RedisPoolInitializer
         // Remove dynamic configuration loading since we're removing Configuration.php
 
         // Register pool as singleton in DI container
-        $this->container->singleton(RedisConnectionPool::class, $pool);
+        #$this->container->singleton(RedisConnectionPool::class, $pool);
 
         return $pool;
     }