feat(restarts): make resource restart limits opt-in

Default restart limits to zero for applications, previews, and services, and bump the Coolify version to 4.3.21.

database/migrations/2026_09_15_105627_make_restart_limits_opt_in.php

@@ -0,0 +1,32 @@
+<?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
+    {
+        foreach (['applications', 'application_previews', 'service_applications'] as $tableName) {
+            Schema::table($tableName, function (Blueprint $table) {
+                $table->integer('max_restart_count')->default(0)->change();
+            });
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        foreach (['applications', 'application_previews', 'service_applications'] as $tableName) {
+            Schema::table($tableName, function (Blueprint $table) {
+                $table->integer('max_restart_count')->default(10)->change();
+            });
+        }
+    }
+};