Fix BadMethodCallException and remaining PostgreSQL issues

app/Http/Controllers/Admin/DashboardController.php

@@ -34,8 +34,9 @@ public function getDashboardData()
     public function yearlySubscriptions()
     {
         $subscriptions = PlanSubscribe::whereYear('created_at', request('year') ?? date('Y'))
-                            ->selectRaw("TO_CHAR(created_at, 'Month') as month, SUM(price) as total_amount")
-                            ->groupBy('month')
+                            ->selectRaw("TO_CHAR(created_at, 'FMMonth') as month, SUM(price) as total_amount")
+                            ->groupBy(DB::raw("TO_CHAR(created_at, 'FMMonth')"))
+                            ->orderBy(DB::raw("MIN(created_at)"))
                             ->get();
 
         return response()->json($subscriptions);