Add saved firewall configuration functionality

- Implemented the ability to save, view, apply, and delete firewall configurations for users.
- Created a new model for FirewallConfiguration and corresponding database migration.
- Enhanced the firewall view to include a tab for managing saved configurations.

extensions/Servers/Proxmox/database/migrations/2025_12_08_000000_create_ext_proxmox_firewall_configurations_table.php

@@ -0,0 +1,35 @@
+<?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::create('ext_proxmox_firewall_configurations', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained()->onDelete('cascade');
+            $table->string('configuration_name');
+            $table->json('firewall_rules');
+            $table->string('incoming_policy', 10)->default('DROP');
+            $table->string('outgoing_policy', 10)->default('ACCEPT');
+            $table->timestamps();
+
+            // Index for faster lookups by user
+            $table->index('user_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('ext_proxmox_firewall_configurations');
+    }
+};