refactor(discovery): enhance exception handling and logging context in FileProcessor

- Add `DiscoveryErrorCode` and `FileSystemErrorCode` to improve error classification in `DiscoveryException`.
- Integrate `LogContext` into `FileProcessor` warnings for enriched logging details.
- Simplify `Environment` variable handling by removing redundant condition checks.

src/Framework/Discovery/Exceptions/DiscoveryException.php

@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace App\Framework\Discovery\Exceptions;
 
+use App\Framework\Exception\Core\DiscoveryErrorCode;
+use App\Framework\Exception\Core\FileSystemErrorCode;
 use App\Framework\Exception\ErrorCode;
 use App\Framework\Exception\ExceptionContext;
 use App\Framework\Exception\FrameworkException;