refactor: change properties in RetentionConfig and RetentionResult to readonly

- Updated properties in `RetentionConfig` and `RetentionResult` classes to be readonly, ensuring immutability after object construction.
- This change enhances data integrity and aligns with best practices for DTOs.

Author: farhadzand

src/DTOs/RetentionConfig.php

@@ -4,17 +4,17 @@
 
 namespace iamfarhad\LaravelAuditLog\DTOs;
 
-final readonly class RetentionConfig
+final class RetentionConfig
 {
     public function __construct(
-        public bool $enabled,
-        public int $days,
-        public string $strategy,
-        public int $batchSize,
-        public int $anonymizeAfterDays,
-        public ?string $archiveConnection,
-        public string $entityType,
-        public string $tableName,
+        public readonly bool $enabled,
+        public readonly int $days,
+        public readonly string $strategy,
+        public readonly int $batchSize,
+        public readonly int $anonymizeAfterDays,
+        public readonly ?string $archiveConnection,
+        public readonly string $entityType,
+        public readonly string $tableName,
     ) {}
 
     public static function fromArray(array $config, string $entityType, string $tableName): self

src/DTOs/RetentionResult.php

@@ -4,17 +4,17 @@
 
 namespace iamfarhad\LaravelAuditLog\DTOs;
 
-final readonly class RetentionResult
+final class RetentionResult
 {
     /**
      * @param  array<string, int>  $entitiesProcessed  Array of entity => count processed
      * @param  array<string>  $errors  Array of error messages
      */
     public function __construct(
-        public int $totalProcessed,
-        public array $entitiesProcessed,
-        public array $errors,
-        public float $executionTime,
+        public readonly int $totalProcessed,
+        public readonly array $entitiesProcessed,
+        public readonly array $errors,
+        public readonly float $executionTime,
     ) {}
 
     public static function empty(): self