feat: enhance pricing page with feature limits and trial management

- Add comprehensive feature limits enforcement middleware
   - Implement subscription dashboard with usage analytics
   - Create reusable plan card component with feature badges
   - Add trial configuration support with limit overrides
   - Fix payment controller null safety issues
   - Improve pricing page UI with proper feature display

app/Models/PlanUsage.php

@@ -19,6 +19,11 @@ class PlanUsage extends Model
         'period_start',
         'period_end',
         'metadata',
+        'subscription_id',
+        'period_type',
+        'created_at',
+        'usage_value',
+        'updated_at',
     ];
 
     protected $casts = [

app/Models/TrialExtension.php

@@ -17,6 +17,8 @@ class TrialExtension extends Model
         'granted_at',
         'granted_by_admin_id',
         'metadata',
+        'original_ends_at',
+        'status',
     ];
 
     protected $casts = [