refactor: update server tag storage to individual columns and remove JSON tags migration

extensions/Servers/Proxmox/database/migrations/2025_12_18_000000_add_tags_to_ext_proxmox_servers.php

@@ -1,30 +0,0 @@
-<?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('ext_proxmox_servers', function (Blueprint $table) {
-            // Store tags as JSON array with format: [{"text": "tag1", "color": "#ff0000"}, ...]
-            // Maximum 3 tags per server
-            $table->json('tags')->nullable()->after('user_set_icon_prefix');
-        });
-    }
-
-    /**
-     * Reverse the migrations.
-     */
-    public function down(): void
-    {
-        Schema::table('ext_proxmox_servers', function (Blueprint $table) {
-            $table->dropColumn('tags');
-        });
-    }
-};