feat: introduce WebSocket sync for XBoard nodes

- Implement Workerman-based `xboard:ws-server` for real-time node synchronization.
- Support custom routes, outbounds, and certificate configurations via JSON.
- Optimize scheduled tasks with `lazyById` to minimize memory footprint.
- Enhance reactivity using Observers for `Plan`, `Server`, and `ServerRoute`.
- Expand protocol support for `httpupgrade`, `h2`, and `mieru`.

database/migrations/2026_03_15_060035_add_custom_config_and_cert_to_v2_server_table.php

@@ -0,0 +1,30 @@
+<?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) {
+            $table->json('custom_outbounds')->nullable()->after('protocol_settings');
+            $table->json('custom_routes')->nullable()->after('custom_outbounds');
+            $table->json('cert_config')->nullable()->after('custom_routes');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('v2_server', function (Blueprint $table) {
+            $table->dropColumn(['custom_outbounds', 'custom_routes', 'cert_config']);
+        });
+    }
+};