feat: ajout entity PriceAutomatic pour les tarifs automatiques

src/Entity/PriceAutomatic.php (nouveau):
- id: int auto-increment
- type: string(50), categorie du tarif (ex: esy-web, esy-mail, ndd)
- title: string(255), intitule du tarif
- description: text nullable, detail du tarif
- priceHt: decimal(10,2), prix hors taxes

src/Repository/PriceAutomaticRepository.php (nouveau)

migrations/Version20260402202703.php:
- Table price_automatic avec colonnes type, title, description, price_ht

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

migrations/Version20260402202703.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 Version20260402202703 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('CREATE TABLE price_automatic (id INT GENERATED BY DEFAULT AS IDENTITY NOT NULL, type VARCHAR(50) NOT NULL, title VARCHAR(255) NOT NULL, description TEXT DEFAULT NULL, price_ht NUMERIC(10, 2) NOT NULL, PRIMARY KEY (id))');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('DROP TABLE price_automatic');
+    }
+}