Revert "Combine data with node_id in api output, so its all still "one day", and fits vanilla xboard behaviour"

This reverts commit de39230cbe111bbf793f11bcf5046ef717c67f87.

The api change caused issues

app/Http/Controllers/V1/User/StatController.php

@@ -14,20 +14,9 @@ class StatController extends Controller
     public function getTrafficLog(Request $request)
     {
         $startDate = now()->startOfMonth()->timestamp;
-        
-        // Aggregate per-node data back to per-day format for backward compatibility
         $records = StatUser::query()
-            ->select([
-                'user_id',
-                'server_rate',
-                'record_at',
-                'record_type',
-                DB::raw('SUM(u) as u'),
-                DB::raw('SUM(d) as d'),
-            ])
             ->where('user_id', $request->user()->id)
             ->where('record_at', '>=', $startDate)
-            ->groupBy(['user_id', 'server_rate', 'record_at', 'record_type'])
             ->orderBy('record_at', 'DESC')
             ->get();