feat: add LXC container support to Proxmox extension

- Add is_lxc boolean column to ext_proxmox_nodes (default false, existing nodes unaffected)
- Add LXC checkbox to admin node creation form (disabled on edit)
- Dynamic API path selection via Node::vmType() (returns 'lxc' or 'qemu')
- LXC deployment: syncLxcSettings() for cores, memory, swap, hostname, rootfs, net config
- LXC network uses name=eth0 format with applyLxcPoolSettings() for VLAN/firewall/MTU
- All lifecycle operations LXC-aware: install, suspend, unsuspend, terminate, upgrade, reinstall
- VNC/xterm console uses correct type (lxc vs kvm)
- All 20+ Livewire components use vmType() for Proxmox API paths
- LXC user interface shows basic-only view (no advanced toggle, no KVM-specific tabs)
- Basic tabs for LXC: Overview, Network Configuration, Backups, Console

extensions/Servers/Proxmox/database/migrations/2026_03_02_000001_add_is_lxc_to_ext_proxmox_nodes_table.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('ext_proxmox_nodes', function (Blueprint $table) {
+            $table->boolean('is_lxc')->default(false)->after('vnc_enabled');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('ext_proxmox_nodes', function (Blueprint $table) {
+            $table->dropColumn('is_lxc');
+        });
+    }
+};