fix: change InitializedHandler logging from info to debug level (#56)

- Changed Log::info to Log::debug in InitializedHandler.php:26
- Prevents excessive log entries in production environments
- Client initialization events will now only log in debug mode
- Resolves production storage and performance concerns

Fixes #50

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: Sangrak Choi <kargnas@users.noreply.github.com>

Author: kargnas

src/Server/Notification/InitializedHandler.php

@@ -23,7 +23,7 @@ public function execute(?array $params = null): void
         // - Triggering initialization events
         // - Recording session start times
 
-        Log::info('MCP Client Initialized', [
+        Log::debug('MCP Client Initialized', [
             'params' => $params,
             'initialized_at' => now()->toISOString(),
         ]);