feat: optimize settings management and admin functionality

- Add system log cleanup functionality with batch processing
- Optimize v2_settings table performance by unifying value storage
- Add comprehensive client support list for one-click subscription
- Fix QR code subscription links for specific node types
- Fix route addition issues in admin management panel
- Enhance admin system controller with log management APIs

database/migrations/2025_06_21_000001_optimize_v2_settings_table.php

@@ -0,0 +1,37 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Facades\DB;
+
+class OptimizeV2SettingsTable extends Migration
+{
+  /**
+   * Run the migrations.
+   *
+   * @return void
+   */
+  public function up()
+  {
+    Schema::table('v2_settings', function (Blueprint $table) {
+      // 将 value 字段改为 MEDIUMTEXT，支持最大16MB内容
+      $table->mediumText('value')->nullable()->change();
+      // 添加优化索引
+      $table->index('name', 'idx_setting_name');
+    });
+  }
+
+  /**
+   * Reverse the migrations.
+   *
+   * @return void
+   */
+  public function down()
+  {
+    Schema::table('v2_settings', function (Blueprint $table) {
+      $table->string('value')->nullable()->change();
+      $table->dropIndex('idx_setting_name');
+    });
+  }
+}