Fix platform fee calculation: use plan percentage instead of instance column

The fee collector was reading service_fee_amount from the instance's invoices
table (always 0). Now calculates fee as total_amount * plan.platform_fee_percent.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Services/FeeCollectorService.php

@@ -36,16 +36,20 @@ public function pullFeesForDate(Instance $instance, string $date): ?PlatformFee
                 ->table('invoices')
                 ->whereDate('created_at', $date)
                 ->where('status', '!=', 'cancelled')
-                ->selectRaw('COUNT(*) as count, COALESCE(SUM(total_amount), 0) as total, COALESCE(SUM(service_fee_amount), 0) as fees')
+                ->selectRaw('COUNT(*) as count, COALESCE(SUM(total_amount), 0) as total')
                 ->first();
 
             DB::disconnect("instance_{$instance->id}");
 
+            $totalAmount = (int) $result->total;
+            $feePercent = $instance->plan->platform_fee_percent ?? 0;
+            $feeAmount = (int) round($totalAmount * $feePercent / 100);
+
             return PlatformFee::updateOrCreate(
                 ['instance_id' => $instance->id, 'date' => $date, 'source' => 'pull'],
                 [
-                    'total_transactions_amount' => (int) $result->total,
-                    'fee_amount' => (int) $result->fees,
+                    'total_transactions_amount' => $totalAmount,
+                    'fee_amount' => $feeAmount,
                     'transaction_count' => (int) $result->count,
                     'verified' => true,
                 ]
@@ -59,7 +63,7 @@ public function pullFeesForDate(Instance $instance, string $date): ?PlatformFee
     public function pullFeesForAllInstances(string $date): array
     {
         $results = [];
-        $instances = Instance::whereIn('status', ['active', 'trial'])->get();
+        $instances = Instance::whereIn('status', ['active', 'trial'])->with('plan')->get();
 
         foreach ($instances as $instance) {
             $fee = $this->pullFeesForDate($instance, $date);