fix: [flow-tester] AdminApiFlowRun 모델 수정

- created_at datetime 캐스팅 추가 (=false로 인한 문제)
- status_color DaisyUI → 순수 Tailwind CSS 클래스로 변경

app/Models/Admin/AdminApiFlowRun.php

@@ -58,6 +58,7 @@ class AdminApiFlowRun extends Model
 
     protected $casts = [
         'flow_id' => 'integer',
+        'created_at' => 'datetime',
         'started_at' => 'datetime',
         'completed_at' => 'datetime',
         'duration_ms' => 'integer',
@@ -162,12 +163,12 @@ public function getStatusLabelAttribute(): string
     public function getStatusColorAttribute(): string
     {
         return match ($this->status) {
-            self::STATUS_PENDING => 'badge-ghost',
-            self::STATUS_RUNNING => 'badge-info',
-            self::STATUS_SUCCESS => 'badge-success',
-            self::STATUS_FAILED => 'badge-error',
-            self::STATUS_PARTIAL => 'badge-warning',
-            default => 'badge-ghost',
+            self::STATUS_PENDING => 'bg-gray-100 text-gray-600',
+            self::STATUS_RUNNING => 'bg-blue-100 text-blue-700',
+            self::STATUS_SUCCESS => 'bg-green-100 text-green-700',
+            self::STATUS_FAILED => 'bg-red-100 text-red-700',
+            self::STATUS_PARTIAL => 'bg-yellow-100 text-yellow-700',
+            default => 'bg-gray-100 text-gray-600',
         };
     }
 }