feat: node traffic limit & batch operations

- Traffic monitoring with transfer_enable limit
- Batch delete nodes
- Reset traffic (single/batch)

database/migrations/2026_03_28_161536_add_traffic_fields_to_servers.php

@@ -0,0 +1,45 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('v2_server', function (Blueprint $table) {
+            if (!Schema::hasColumn('v2_server', 'transfer_enable')) {
+                $table->bigInteger('transfer_enable')
+                    ->default(0)
+                    ->after('rate')
+                    ->comment('Traffic limit , 0 or null=no limit');
+            }
+            if (!Schema::hasColumn('v2_server', 'u')) {
+                $table->bigInteger('u')
+                    ->default(0)
+                    ->after('transfer_enable')
+                    ->comment('upload traffic');
+            }
+            if (!Schema::hasColumn('v2_server', 'd')) {
+                $table->bigInteger('d')
+                    ->default(0)
+                    ->after('u')
+                    ->comment('donwload traffic');
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('v2_server', function (Blueprint $table) {
+            $table->dropColumn(['transfer_enable', 'u', 'd']);
+        });
+    }
+};