fix: resolve known issues and improve code standards

- Fix known bugs in user, plan, and server modules
- Standardize code formatting and structure
- Optimize database queries and model relationships
- Improve request validation and error handling
- Update admin controllers for better consistency

app/Http/Controllers/V2/Admin/SystemController.php

@@ -13,6 +13,7 @@ use Laravel\Horizon\Contracts\MetricsRepository;
 use Laravel\Horizon\Contracts\SupervisorRepository;
 use Laravel\Horizon\Contracts\WorkloadRepository;
 use Laravel\Horizon\WaitTimeCalculator;
+use App\Helpers\ResponseEnum;
 
 class SystemController extends Controller
 {
@@ -257,7 +258,7 @@ class SystemController extends Controller
             ]);
 
         } catch (\Exception $e) {
-            return $this->error('清除日志失败：' . $e->getMessage());
+            return $this->fail(ResponseEnum::HTTP_ERROR, null, '清除日志失败：' . $e->getMessage());
         }
     }
 
@@ -293,7 +294,7 @@ class SystemController extends Controller
             return $this->success($stats);
 
         } catch (\Exception $e) {
-            return $this->error('获取统计信息失败：' . $e->getMessage());
+            return $this->fail(ResponseEnum::HTTP_ERROR, null, '获取统计信息失败：' . $e->getMessage());
         }
     }
 }

app/Http/Controllers/V2/Admin/TrafficResetController.php

@@ -71,7 +71,7 @@ class TrafficResetController extends Controller
     $logs = $query->paginate($perPage);
 
     // 格式化数据
-    $logs->getCollection()->transform(function ($log) {
+    $formattedLogs = $logs->getCollection()->map(function (TrafficResetLog $log) {
       return [
         'id' => $log->id,
         'user_id' => $log->user_id,
@@ -99,7 +99,7 @@ class TrafficResetController extends Controller
     });
 
     return response()->json([
-      'data' => $logs->items(),
+      'data' => $formattedLogs->toArray(),
       'pagination' => [
         'current_page' => $logs->currentPage(),
         'last_page' => $logs->lastPage(),
@@ -198,7 +198,8 @@ class TrafficResetController extends Controller
 
     $history = $this->trafficResetService->getUserResetHistory($user, $limit);
 
-    $data = $history->map(function ($log) {
+    /** @var \Illuminate\Database\Eloquent\Collection<int, \App\Models\TrafficResetLog> $history */
+    $data = $history->map(function (TrafficResetLog $log) {
       return [
         'id' => $log->id,
         'reset_type' => $log->reset_type,