Add isHidden to Category, category CRUD tests, coverage improvements

- Add isHidden field to Category entity with migration (DEFAULT false for existing rows)
- Add isHidden checkbox to edit category template and "Masquee" badge on category list
- Save isHidden in editCategory controller method
- Fix Category.isActive() indentation
- Create CategoryTest with full coverage (14 tests): defaults, setters, setEvent logic, isActive, isHidden
- Add category CRUD tests to AccountControllerTest: add/edit/delete/reorder categories with access control
- Add cookie-consent tests for dev env early return and Cloudflare tunnel script
- Exclude PayoutPdfService from phpunit coverage and SonarQube analysis

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

migrations/Version20260320221953.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260320221953 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE category ADD is_hidden BOOLEAN DEFAULT false NOT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE category DROP is_hidden');
+    }
+}