feat: add update page, refactor update checking process

database/migrations/2026_01_16_083707_create_settings_table.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up()
+    {
+        Schema::create('settings', function (Blueprint $table): void {
+            $table->id();
+
+            $table->string('group');
+            $table->string('name');
+            $table->boolean('locked')->default(false);
+            $table->json('payload');
+
+            $table->timestamps();
+
+            $table->unique(['group', 'name']);
+        });
+    }
+};